B Block (Below Ground)

A General Works
B Philosophy, Religion
     B-BJ Philosophy, Psychology
     BL-BX Religion
C History and Auxiliary Sciences
     CB History of  Civilization
     CC Archaeology
     CT Biography
D History (except America)
     DA Great Britain
     DR Turkish History
     DS Asia (including the Near East)

B Block (Ground Level)

     E-F American History (North and South)
G Geography, Anthropology, Tourism
H Social Sciences
     HA Statistics
     HB-HE Economics
     HF Commerce (including Office
            Management)
     HG-HJ Finance
     HM-HX Sociology
J-JL Political Science

B Block (1st Floor)

N Fine Arts
TR Photography

B Block (2nd Floor)

   JN-JX Political Science (cont.)
K Law
    KD-KDK United Kingdom & Irish Law
    KDZ-KHW  North & South American Law
    KJ-KKZ European Law
        KKX Turkish Law
    KL-KWX Law of Asia & Eurasia, Africa, Pacific
                    Area & Antarctica
    KZ Law of Nations
L Education
M Music
P Language and Literature
     PE English Language
     PL Languages of Eastern Asia, Africa, Oceania
          PL 101-271 Turkish Language and Literature
     PQ Romance Literature

A Block (2nd Floor)

     PR English Literature
     PS American Literature
Q Science
     QA Mathematics
     QB Astronomy
     QC Physics
     QD Chemistry
R Medicine (Bilkent uses "W" following 
     National Library of Medicine scheme)
S Agriculture
T Technology
     TK Electrical Engineering
     TP Chemical Technology
     TR Photography (see Art Library B Block ,
            1st floor)
U Military Sciences
V Naval Sciences
W Medicine (National Library of Medicine)
Z Bibliography and Library Science