found: Author's The Indians knew, 1957.
found: BL database, 2011(hdg.: Pine, Tillie Schloss)
found: Author's The Africans knew , ©1967:title-page (Tillie S. Pine)
found: Wikipedia, viewed March 16, 2023(heading: Tillie S. Pine; Tillie Schloss Pine (4 March 1896-1999) was an American writer of children's books in the 20th century. Pine was born in Pułtusk, in Poland, on 4 March 1896. She was the daughter of Louis and Rachel Schloss. After the family moved to New York City, she married Nat Pine in 1924. Pine is recognized for her children's science and multi-cultural books, primarily illustrated by Ezra Jack Keats. Pine worked closely with fellow author Joseph Levine in producing her works. Pine died in 1999 at age 102) - https://en.wikipedia.org/wiki/Tillie_S._Pine