Little Feather series - by Bernard Palmer
1944 - Little Feather at Big Bear Lake #1
19?? - Little Feather Goes Hunting
1948 - Little Feather and the Mystery Mine
195? - River of Grass #7
there are more books in this series but hard to find names of!

The Wilderness Mystery Series - by Troy Nesbit
1952 - Sand Dune Pony Mystery
1954 - The Jinx of Payrock Canyon
1954 - Indian Mummy Mystery
1955 - Mystery at Rustler's Fort
1956 - Diamond Cave Mystery
1962 - Forest Fire Mystery
1966 - The Hidden Ruin

Leonard and his Time MachineSeries - by Gene Darby
1965 - Leonard Visits Space
1965 - Leonard Visits the Ocean Floor
1965 - Leonard Visits America
1965 - Leonard Visits Dinosaur Land
1967 - Leonard discovers Africa
1967 - Leonard visits Sitting Bull
1967 - Leonard equals Einstein

New World Neighbors series
1941 - Letters From Guatemala by Delia Goetz
1941 - Along the Inca Highway by Alida Malkus
1941 - Kimbi, Indian of the Jungle by Henry Lionel Williams
1941 - The Gaucho's Daughter by Katherine G. Pollack
1941 - Exploring the Jungle by J.M.Waldeck
1941 - Around the Caribbean by Nora Burglon
1942 - Up Canada Way by Helen Dickson
1942 - Children of Mexico by Dorothy Childs Hogner
1942 - Riches of South America by V. Wolfgang Von Hagen
1942 - Riches of Central America by V. Wolfgang Von Hagen
1942 - Boys of the Andes by Alice Desmond
1942 - Ootah and his Puppy by Marie Ahnighito Peary
1942 - Rico the Young Rancher by Patricia Crew Fleming
1942 - Around the Year in Iceland by Elizabeth Yates
1942 - Sky High in Bolivia by Ruth Cady Adams
1942 - Six Great Men of Brazil by Very Kelsey
1944 - Pioneers of Puerto Rico by Muna Lee

Bobbsey Twins Series - by Laura Lee Hope
1904 - The Bobbsey Twins          1945 - ...at Mystery Mansion
1907 - ...in the Country                  1946 - ...at Sugar Maple Hill
1907 - ...at the Seashore              1947 - ...in Mexico
1913 - ...at School                          1948 - ...Toy Shop
1913 - ...at Snow Lodge                1949 - ...in Tulip Land
1915 - ...on a Houseboat               1950 - ...in Rainbow Valley
1915 - ...at Meadow Brook            1951 - ...own Little Railroad
1916 - ...at Home                            1952 - ...at Whitesail Harbor
1917 - ...in a Great City                  1953 - ...horseshoe riddle
1917 - ...on Blueberry Island          1953 - ...at Bigbear Pong
1918 - ...on the Deep Blue Sea    1954 - ... on a Bicycle Trip
1919 - ...in Washington                  1956 - ...own Little Ferryboat
1920 - ...in the Great West             1956 - ...at Pilgrim Rock
1921 - ...at Cedar Camp                1957 - ...Forest Adventure
1922 - ...at the Country Fair           1959 - ...at London Tower
1923 - ...Camping Out                    1960 - ...at the Mystery Cave
1924 - ...and Baby May                  1961- ...in Volcano Land
1925 - ...Keeping House                1962 - ...the Goldfish Mystery
1926 - ...at Cloverbank                   1963 - ...big River Mystery
1927 - ...at Cherry Corners           1963 - ...stories to read aloud
1928 - ...and their Schoolmates   1964 - ...Greek Hat Mystery
1929 - ...treasure hunting              1965 - ...Green Rooster
1930 - ...at Spruce Lake               1966 - ....Camel Adventure
1931 - ...Wonderful Secret            1967 - ...King's Puppet
1932 - ...at the Circus                     1968 - ...Candy Castle
1933 - ...on an Airplane Trip          1969 - ...Doodlebug Mystery
1934 - ...solve a Mystery                1970 - ...Talking Fox Mystery
1935 - ...on a Ranch                        1971 - ...Red, White Blue
1936 - ...in Eskimo Land                1972 - ...Dr. Funnybone
1937 - ...in a Radio Play                  1973 - ...Tagalong Giraffe
1938 - ...at Windmill Cottage          1974 - ....Flying Clown
1939 - ...at Lighthouse Point          1975 - ...Sun Moon Cruise
1940 - ...at Indian Hollow                1976 - ...Freedom Bell
1941 - ...at the Ice Carnival             1977 - ...Smokey Mountain
1942 - ...in the Land of Cotton        1978 - ...TV Mystery
1943 - ...in Echo Valley                    1979 - ...Coral Turtle
1944 - ...on the Pony Trail

Betsy Series - by Carolyn Haywood
1939 - "B" Is for Betsy
1941 - Betsy and Billy
1943 - Back to School with Betsy
1945 - Betsy and the Boys
1950 - Betsy's Little Star
1954 - Betsy and the Circus
1956 - Betsy's Busy Summer
1958 - Betsy's Winterhouse
1962 - Snowbound with Betsy
1967 - Betsy and Mr. Kilpatrick
1970 - Merry Christmas from Betsy
1977 - Betsy's Play School
(non-Betsy): 1964 - Here Comes the Bus!
(non-Betsy): 1946 - Penny and Peter
(non-Betsy): 1947 - Little Eddie
(non-Betsy): 1951 - Eddie and Gardenia
(non-Betsy): 1964 - Eddie's Green Thumb

Adventure Girls - by Clair Blank
1936 - At K Bar O
1936 - In the Air
1936 - At Happiness House

Matthew and Maria Looney - by Jerome Beatty, Jr.
1961 - Matthew Looney's Voyage to the Earth
1965 - Matthew Looney's Invasion of the Earth
1969 - Matthew Looney in the Outback
1972 - Matthew Looney and the Space Pirates
1977 - Maria Looney on the Red Planet
1978 - Maria Looney and the Cosmic Circus
1979 - Maria Looney and the Remarkable Robot

Ginnie and Geneva - by Catherine Woolley
1948 - Ginnie and Geneva
1951 - Ginnie Joins In
1954 - Ginnie and the New Girl
1957 - Ginnie and the Mystery House
1960 - Ginnie and the Mystery Doll
1962 - Ginnie and her Juniors (aka Ginnie's Babysitting Business)
1966 - Ginnie and the Cooking Contest
1967 - Ginnie and the Wedding Bells
1969 - Ginnie and the Mystery Cat
1973 - Ginnie and the Mystery Light

Cathy - by Catherine Woolley
1956 - A Room for Cathy
1958 - Miss Cathy Leonard
1961 - Cathy Leonard Calling
1964 - Cathy's Little Sister
1968 - Chris in Trouble
1971 - Cathy and the Beautiful People
1972 - Cathy Uncovers a Secret

Morgan Bay Mysteries - by John and Nancy Rambeau
1962 - Mystery of Morgan Castle
1962 - Mystery of the Marble Angel
1962 - Mystery of the Midnight Visitor
1962 - Mystery of the Missing Marlin
1965 - The Mystery of the Musical Ghost
1965 - The Mystery of Monks' Island
1965 - The Mystery of the Marauder's Gold
1965 - The Mystery of the Myrmidon's Journey

Doctor Dolittle - by Hugh Lofting
1920 - Story of Doctor Dolittle
1922 - Voyages of Doctor Dolittle
1923 - Doctor Dolittle's Circus
1924 - Doctor Dolittle's Caravan
1925 - Doctor Dolittle and the Green Canary
1926 - Doctor Dolittle's Post Office
1927 - Doctor Dolittle's Garden
1928 - Doctor Dolittle in the Moon
1968 - Doctor Dolittle Tales

Honey Bunch Series - by Helen Louise Thorndyke
1923 - Honey Bunch, Just a Little Girl
1923 - Her First Visit to the City
1923 - Her First Days on a Farm
1924 - Her First Visit to the Seashore
1924 - Her First Little Garden
1925 - Her First Days in Camp
1926 - Her First Auto Tour
1927 - Her First Trip on the Ocean
1928 - Her First Trip West
1929 - Her First Summer on an Island
1930 -Her First Trip on the Great Lakes
1931 - Her First Trip in an Airplane
1932 - Her First Visit to the Zoo
1933 - Her Fist Big Adventure
1934 - Her First Big Parade
1935 - Her First Little Mystery
1936 - Her First Little Circus
1937 - Her First Little Treasure Hunt
1938 -Her First Little Club
1939 - Her First Trip in a Trailer
1940 - Her First Trip to a Big Fair
1941 - Her First Twin Playmates
1943 - Her First Costume Party
1946 - Her First Winter at Snowtop
1947 - Her First Trip to the Big Woods
1949 - Her First Trip to a Lighthouse
1950 - Her First Visit to a Pony Ranch
1953 - Her First Visit to a Reindeer Farm

Ginny Gordon Series - by Julie Campbell
1948 - Ginny Gordon and the Mystery of the Disappearing Candlesticks
1950 - ...and the missing heirloom
1951 - ...and the mystery of the old barn
1954 - ...and the lending library
1956 - ...and the broadcast mystery

Five-Yard Fuller Series - by Bob Wells
1964 - Five-Yard Fuller
1967 - ...and the Unlikely Knights
1967 - ...of the New York Gnats
1970 - ...'s Mighty Model T

Jim Forest Series - by John and Nancy Rambeau
1959 - Jim Forest and Ranger Don
1959 - ...and the Bandits
1959 - ...and the Mystery Hunter
1959 - ...and Dead Man's Peak
1959 - ... and the Flood
1959 - ...and Lone Wolf Gulch
1967 - ...and the Plane Crash
1967 - ...and the Ghost Town
1967 - ...and Woodman's Ridge
1967 - ...and the Trapper
1967 - ...and Lightning
1969 - ...and the Phantom Crater

Miss Pickerell Series by Ellen MacGregor
1951 - Miss Pickerell goes to Mars
1953 - ...and the Geiger Counter
1953 - ...goes Undersea
1954 - ...goes to the Arctic
1964 - ...on the Moon
1966 - ...goes on a Dig
1968 - ...harvests the Sea
1971 - ...and the Weather Satellite
1974 - ...meets Mr. H.U.M.
1976 - ...takes the Bull by the Horns
1977 - ...and the Supertanker
1977 - ...to the Earthquake Rescue
1980 - ...tackles the Energy Crisis
1982 - ...on the Trail
1983 - ...and the Blue Whales

Button Family Adventure Series - by Edith McCall
1953 - Bucky Button
1954 - Buttons at the Zoo
195? - Buttons and the pet parade
195? - Buttons take a boat ride
195? - Buttons at the Farm
195? - Buttons and Mr. Pete
195? - Buttons go Camping
195? - Buttons and the Boy Scouts
195? - Buttons at the soap box derby
1958 - Buttons and the Little League
1960 - Buttons and the Whirlybird
1960 - Buttons see things that go