Dorothea Lange was a great photographer. She is probably best known for her photos from the Depression.
There are books available from the National Gallery and MOMA exhibitions linked to below. There’s also a DVD from PBS.
Dorothea Lange Words & Pictures (Museum of Modern Art Exhibition from 2020)
Dorothea Lange: Seeing People (National Gallery of Art Exhibition from 2023-2024)
Women Come to the Front Dorothea Lange
The Library of Congress had an exhibit about her and also has many of her Depression photos
This is her most famous photo:
Dorothea Lange’s “Migrant Mother” Photographs in the Farm Security Administration Collection
The photos in the Instagram post above are from the National Archives. This group of pages list all of the Lange photographs in the Archives.