A few sources include: Garry Winogrand, Figments...
Robert Frank, Moving Out
Contacts Vols. 1,2, and 3 (DVDS)
Not sure if these are to your liking, but since you mention Riboud and Koudelka, you'll probably like them. Contacts 1 has HCB, Erwitt, Riboud, Klein, Doisneau, and others.

Jmal