The next chart from a 1982 exhibit at Yale University Art Gallery illustrates a fairly unusual pattern - namely, a lengthy quiescent period between the 19th century active era for
this group of "naturalistic" photographers in Philadelphia and the reappearance in museum exhibits in the 1970s and continuing. This isn't just wartime - rather, forgotten for a full 60 years.
Magnum, Paris prepared this exhibit - 50 photographers covering cinema on the occasion of their 50th Anniversary in 1997. A smaller version - roughly half as large - also focused on cinema was circulated by Curatorial Assistance for several years beginning in 2000.
Family of Man - Steichen and Wayne Miller's 1955 exhibit at MOMA (and extensively toured in both the US and Europe for several years thereafter). Note the significant number of first-time exhibitors among the over 260 photographers as well as a few photographers seemingly never heard from again and others whose exhibitions histories appear to have been launched by this most famous of all photography exhibits including its best-selling catalog.