Radical progressive children's books (photo-illustrated)

QUESTION: Socially-Motivated Photo-Illustrated Children's Books (50's. 60's, 70's, 80's)

question / pregunta: 

I am searching for analyses of socially-motivated, politically-informed photo-illustrated children's books of mid to late 20th century. The genre appears to have peaked in the 1970's and then collapsed. I am writing a speculative article regarding this and would like to be, well, less speculative.
Many Thanks.

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