Mom (Harriet Claycomb) and her dear friend, Peg Prout, created the Doorstep Library in Detroit, Michigan, about 1937-38.
They carried books in the trunk of the car and delivered to patrons. Put 25 cents in the envelope inside the back cover and you could keep the book for a week.
This envelope is from “All This and Heaven Too” by Rachel Field, 1938.
This I Leave 