Unrelated to the course but I wanted to save this for future reference. Someone on a forum has allegedly located the other images shot by Lange alongside the Migrant Mother.
In effect this is like looking at a contact sheet, seeing the selected image within the context of the others taken at the time. The others taken are all wider views taken further away. On one hand they carry less impact but they do show more environmental context of where these migrants live.
Photography 1 - Identity and Place 