Rondal Partidge, son of Imogen Cunningham, had a very early start into photography. “Partridge began helping his mother in the darkroom at the age of five. At seventeen he became Dorothea Lange’s apprentice, driving her up and down the back roads of California as she created her well-known images of migrant laborers.” Later, he worked with Ansel Adams. In 1940, he worked on a series called “california Youth” - a lot of which is online.