Subject
Operas
70
Soviet Union History
25
Soviet Union Politics and government
25
Mathematics
22
Russia History
17
Russia Social life and customs
13
Folk songs, Russian
12
Mathematical physics
12
Physics
12
Songs (High voice) with piano
12
Songs (Low voice) with orchestra
12
Criticism and interpretation
11
Russian language English
11
Soviet Union Social conditions
11
Communism
10
Geochemistry
10
Heads of state
10
Mathematical analysis
10
Mechanics
10
Russian poetry
10
Stochastic processes
10
World War, 1939-1945
10
Geology, Stratigraphic
9
Plasma (Ionized gases)
9
Probabilities
9
Russian language
9
Russian literature History and criticism
9
Songs, Russian
9
Boundary value problems
8
Elasticity
8
Geology
8
Quantum theory
8
Russia (Federation) History
8
Russian language Grammar
8
Short stories, Russian
8
Songs (High voice) with orchestra
8
Voyages around the world
8
Alaska Description and travel
7
Folk music
7
Functional analysis
7
Geometry
7
Political prisoners
7
Prospecting
7
Radioisotopes Industrial applications
7
Russian literature
7
Uranium ores
7
Alaska History
6
Authors, Russian
6
Biophysics
6
Differential equations, Partial
6
more ...