Most college and university libraries arrange their books using the Library of Congress Classification system.
This system uses the letters of the alphabet to distinguish major subject divisions.
For History, note especially:
D call numbers = World History--Floor 3 in Milner Library.
DA -- Great Britain.
DA 690 .L8 -- Liverpool
DD -- Germany.
DD 851 - 900 --- Berlin.
DG -- Italy.
DG 791 - 800 -- Vatican City.
DS -- Asia.
DS 801 - 897 -- Japan.
DS 896.35 -- Tokyo.
E call numbers = United States History -- Floor 3 in Milner Library.
F call numbers = State and Local U.S. History; Canadian History; Latin American History -- Floor 4 in Milner Library.
F 536 - 550 -- Illinois.
F 548 -- Chicago.
F 576 - 590 -- Wisconsin.
F 589 .M6 -- Milwaukee.
F 461 - 475 -- Missouri.
F 474 .S2 -- St.Louis.
F 176 - 190 -- Maryland.
F 189 .B1 -- Baltimore.
F 146 - 160 -- Pennsylvania.
F 158 -- Philadelphia.
H call numbers = Social Sciences -- Floor 4 in Milner Library.
Note especially the HT call numbers for books on Urban Studies.
Also search by subject for specific cities, such as Paris, Berlin, Tokyo, New York, Chicago, etc.