Here are a few lovely examples:
The Easy Road To Reading, Lyons & Carnihan 1919-25, illustrated by Mary Louise Spoor and Gertrude Spaller.
The Easy Road To Reading First Reader. Illustrated by Mary Louise Spoor. For more on ML Spoor
Happy Days, Quinlan Readers. 1949 Allen and Bacon Publishers
Down Our Street. McMillan 1939.
Health Stories and Practice, 1931, Lyons & Carnahan publisher, illustrations by Vera Stone Norman and Irene Dorcy
Childhood Readers, City and Country, Scribners,1932, illustrated by Florence and Margaret Hoopes and Margaret Freeman.