Authors of Books for Young People by Martha Ward and Dorothy Marquardt (1971) is the Second Edition of a book that was used for many years as an aid to building a great Children's Library.
Below are authors and titles that were referenced in the book that I have also had (and may currently have) in stock.
This is a great reference to still build a great children's library if you are focusing on pre 1970's Children's Literature.

Jules Archer
1915-2008
Writer of History for Young People, World War II Vet
Samuel Hopkins Adams
1871-?
Erie Canal Authority
Authored 4 Books in the Landmark Series

Erie Canal

Louisa May Alcott
1832-1888
Novelist

Little Women
Little Men
Eight Cousins


Lloyd Alexander
1924-2007
Newbery Medalist
Allyn Allen
Pseudonym of Irmegarde Eberle
Paul Bacon
1913-?
Biologist, Luther Burbank historian

Creating New and Better Plants: Luther Burbank

Curtis Kent Bishop
1912-1967
Western Author, Texas Newspaperman, Sport Fiction Writer

Lone Start Leader: Sam Houston

Wyatt Blassingame.
1909-1985
Horror Author (As W. B. Rainey), Juvenille Non-Fiction Author
Authored 4 Books in the Landmark Series
Bruce Bliven, Jr.
1916-2002
Newspaper Reporter, Military Author, World War II Vet
Authored 4 Books in the Landmark Series

From Pearl Harbor to Okinawa
The Story of D-Day: June 6, 1944

Robert Sidney Bowen
1900-1977
Pilot
Author of the War Adventure Series (Dave Dawson)
Barbara Briggs
?-?
Author, Illustrator
The Otter Twins

Joseph Bryan III
1904-1993
Military Veteran, Newspaper Reporter, Magazine Writer
Covered Circuses for Several Major Periodicals
Authored 1 Book in the Landmark Series

The World's Greatest Showman: The Life of P. T. Barnum

Katherine Burton
1887-1969
Roman Catholic Biographer
Family Rights Activist
Authored 1 Book in the Credo Books (Catholic Biographies)

The Door of Hope

Nardi Reeder Campion
1917-2007
Author
Sister of Colonel Red Reeder
Co-Authored 1 Book in the Landmark Series
Henry Castor
1909-?
Military Non-Fiction
Authored 2 Books in the Landmark Series

America's First World War

Edmund Collier
?-?
Western Frontier Expert, Editor of WEST magazine
Father of Newbery Honor Author Christopher Collier
Authored 3 books in the Signature Books Series
Fred Cook
1911-2003
Investigative Journalist

Rallying a Free People: Theodore Roosevelt


Leonard Cottrell
1913-1974
Archeologist, Author
Egypt Expert
James Daugherty
1889-1974
Artist, Illustrator, Author
Newbery Medal, Caldecott Honor
Authored 3 Books in the Landmark Series

The Magna Carta
Landing of the Pilgrims

August Derleth
1909-1971
Horror and Science Fiction Author, Founder of Arkham House Publishing
Authored 3 Books in the Vision Books Series
Irmengarde Eberle
1898-1979
Author and Editor
Samuel and Beryl Epstein
1909-2000 Samuel, 1910-1999 Beryl
Authors
Edward E. Fitzgerald
1919-2001
Sports Author, President Book Division Doubleday Publishing
Authored 1 Books in the Vision Books Series

Champions in Sports and Spirit


Franklin Folsom
1907-?
Teacher, Journalist, Children's Fiction & Non-Fiction Author
Shannon Doris Garst
1894-1981
Wyoming Historian and Author
Michael Gorham
Pseudonym for Franklin Folsom
Shirley Graham (DuBois)
1907-1977
Daughter of Methodist Missionary (African Methodist Episcopal)
NAACP Field Secretary
Authored 1 books in the Signature Books Series

The Story of Pocahontas

Alden Hatch
1898-1975
Biographer

Young Ike

Walter Havighurst
1901-1994
English Professor, Social Historian of Midwest States
Authored 1 Book in the Landmark Series

Buffalo Bill's Great Wild West Show

Russell Hoban
1925-2011
Science Fiction, Fantasy, and Children's Author

Stephen Holt
Pseudonym for Harlan H. Thompson

James Bryan Icenhower
1913-??
Naval Captain
The First Book of the Antarctic

James Kjelgaard
1910-1959
Trapper, Laborer, Author
Authored 2 Books in the Landmark Series
Clayton Knight
1891-1969
Aviator, World War I Veteran, World War II Correspondent
Authored 3 Books in the We Were There Series
Joseph Alvin Kugelmass
1910-?
Newspaperman, Author
Israel E. Levine
1923-?
Biographer for Young People

Champion of World Peace: Dag Hammarskjold

Arnold Lobel
1933-1987
Illustrator
Caldecott Award Winner
Milton Lomask
Biographer
1909-1991
Authored 3 Books in the American Background Series
Authored 5 Books in the Vision Books Series
Alice Marriott
1910-1992
Historian of Native Americans
Authored 1 Book in the Landmark Series

Sequoyah: Leader of the Cherokees

Helen Markley Miller
1896-1984
Writer of Biographies for Children, Mostly Characters of the Western United States
Ralph Moody
1898-1984
Cowboy, Western Author
Authored 2 Books in the Landmark Series

Kit Carson and the Wild Frontier

Richard Morenus
1897-??
Author, Lecturer, Canadian Frontier Survivalist
Authored 1 Book in the Landmark Series

The Hudson's Bay Company

Iris Noble
1922-?
Biographer for Young People
Sterling North
1906-1974
Editor, Author
Howard Pease
1894-1974
Black Tanker
Olive Price
1903-1991
Children's Author and Playwright
Authored 2 books in the Signature Books Series
Adolph Regli
1896-?
Western American Historian
Quentin Reynolds
1902-1965
Newspaper Reporter, Author
Authored 6 Books in the Landmark Series

Custer's Last Stand

Louise Dickinson Rich
1903-1991
English Teacher, New England Historian
Felix Riesenberg, Jr.
1913-1962
Maritime Author
Authored 2 Books in the Landmark Series

Balboa: Swordsman and Conquistador
Story of the Naval Academy

Paul Rink
1912-1995
Screenwriter, World War II Intelligence

Remaking Modern Fiction: Ernest Hemingway

Katharine Scherman
1915-2009
Non-Fiction Author
Daughter of Bernardine Kielty
Authored 2 Books in the Landmark Series

Catherine the Great
The Slave Who Freed Haiti: The Story of Toussaint Louverture

Karl Schuon
1913-1984
World War II Veteran (Marines)
Military Author
Norah Smaridge
1903-
Roman Catholic Author and Publisher
Authored 1 Book in the Credo Books (Catholic Biographies)
Eunice Young Smith
1902-1993
Christmas Card Illustrator, Author

Armstrong Sperry
1894-1976
Illustrator, Author
Authored 3 Books in the Landmark Series
Augusta Stevenson
1869-1976
Author, Editor of " Childhood of Famous Americans " Series
Authored 29 Books in the Childhood of Famous Americans

Wilbur and Orville Wright: Boys with Wings


Charles Stanley Strong
1906-1962
Explorer, Author, Lecturer

The Real Book About the Antarctic

Anico Surany
?-?
Felix Sutton
?-?
Journalist and American Historian
Authored 3 Books in the We Were There Series
Ellen Tarry
1906-2008
Teacher, Author, "Story Lady" of the Harlem Community Center
Authored 2 Books in the Vision Books Series
Harlan H. Thompson
1894-1988
Rancher and Horse Lover
Authored 2 Books in the We Were There Series (As Stephen Holt )
Richard Tregaskis
1916-1973
WW II War Correspondent
Authored 2 Books in the Landmark Series

John F. Kennedy and PT-109

Jessie Treichler
?-?
Educator

Educating for Democracy: Horace Mann

Iris Vinton
1906-1988
Teacher, Author, Director of Publications at Boys Club of America
Authored 1 Book in the We Were There Series
Authored 4 books in the Signature Books Series

The Story of John Paul Jones

Victor Von Hagen
1908-1985
Archeologist, Anthropologist
Mable Watts
1906-?
Children's Author
Robert N. Webb
?-?
Historial Author
Authored 7 Books in the We Were There Series
Mable Widdemer
1902-1964
Children's Librarian
Authored 8 Books in the Childhood of Famous Americans Series
Katharine Elliott Wilkie
1904-1980
Jr. High Teacher, Author
Authored 7 Books in the Childhood of Famous Americans Series
Aleck Bell: Ingenious Boy
Charles Morrow Wilson
1905-1977
Arkansas Historian, State Department Representative, Latin America Expert
Authored 1 Book in the Credo Books (Catholic Biographies)
Hazel Wilson
1898-1992
Professor, Librarian
Authored 2 books in the Signature Books Series
Frances Winwar
1900-1985
Italian/American Biographer, Translator, Fiction Author
Authored 2 Books in the Landmark Series

Queen Elizabeth and the Spanish Armada

Anne Terry White
1896-1980
Science and History Author
Authored 4 Books in the Landmark Series

Prehistoric America
The First Men in the World


Jane Yolen
1939-NDD
Author of Children's Books
Charlotte Zolotow
1915-2013
Childrens Picture Book Author