Classification
CAA - Chemistry - reference books
7
DAA - Information technology - reference books
7
EAA - Energy - reference books
7
GAA - Geosciences - reference books
7
HAA - Medicine - reference books
LAA - Biology - reference books
PAA - Physics - reference books
7
TAA - Engineering sciences - reference books
AQPD - Bibliographies of theses / dissertations
4
YAA - Law, economy, social affairs - reference books
2