[Smersh]

okay, I have checked the map repository.
They have a sporadic collection of maps at 1:50,000 scale of the western soviet union between I was told 1920-50.

Here are the locations I noted, that they have.

Crimea: -northern area around sevastapol, not the city itself
-Eastern area of the crimean peninsula, and the northern -crimean land bridge area. none anywhere else in the crimea.

Kursk:
-the city of kursk, and the near immediate area around the city.
-Belgorod area, Kharkov area also.
- Don river area, quite extensively.
Rostov:
-large part of the Rostov area
Ukraine:
-large part of southern ukraine, quite extensive but sporiadic.
Everything else:
again very spordiac everywhere else, almost nothing of the northern soviet union, no coverage of moscow, only some tiny areas of the leningrad district.

edit: I didn't check anything of manchuria, but in general china seemed to be covered well, from what I saw in passing.