Subject
Social security
11
Poland History
7
Mathematical analysis
4
Poland Military relations
4
Songs (High voice) with orchestra
4
United States Military relations
4
Communication of technical information
3
Economics
3
Holocaust, Jewish (1939-1945)
3
Judicial assistance
3
Mathematics
3
Mathematics History
3
Physical measurements
3
Polish poetry
3
Popular music
3
Quantum theory
3
Rock mechanics
3
Set theory
3
Supplemental security income program
3
Alcoholism Treatment
2
Artificial intelligence
2
Capital investments
2
Communication in law enforcement International cooperation
2
Educational exchanges Law and legislation
2
Extradition
2
Folk songs, Polish
2
Identification numbers, Personal
2
Jews Persecutions
2
Katyn Massacre, Katynʹ, Russia, 1940
2
Law enforcement International cooperation
2
Mathematicians
2
Mathematics Philosophy
2
Mechanics, Applied
2
Mining engineering
2
Nuclear fuels Law and legislation
2
Operas
2
Pharmaceutical services insurance Government policy
2
Philosophy, Modern
2
Poland
2
Poland Ethnic relations
2
Poland Politics and government
2
Polish language English
2
Rome History
2
Spectrum analysis
2
Spent reactor fuels Transportation
2
Strength of materials
2
Systems biology
2
Topology
2
United States Armed Forces Legal status, laws, etc
2
Warsaw (Poland) History
2
more ...