As a Subscriber you will see all 240 images which will give you a far better sense of what was happening within a single year. At the moment you can see 10.
A. Tartakovsky, Soyuzfoto, M. Menzheritsky, Alexey Gostev & Mikhail Prekhner, 1939, Front cover for USSR in Construction, no. 8, The Twenty-first Year of the Revolution, Magazine cover, International Center of Photography (ICP), LL/63891