Subject Headings:

Geography, Ancient
Classical geography
Historical geography

Barrington Atlas of the Greek and Roman World, ed. R. J. A. Talbert.  Princeton, N.J. : Princeton University Press, 2000.
Perkins Reference --- G1033 .B3 2000,directory  
Perkins Reference Atlas Case Oversize  | G1033 .B3 2000. (atlas)
A project of the Ancient World Mapping Center at UNC (http://www.unc.edu/awmc/ - an excellent web source for all ancient geography, including free online maps), this is the definitive new classical atlas.

Atlas of Classical History, R. J. A. Talbert.  New York : Macmillan, c1985.
Perkins Reference -- G1033 .A833 1985
Useful for quick reference for specific historical events and periods (Battle of Salamis, Greek Colonization). Includes small-scale but detailed and easily-photocopied maps.

Dictionary of Greek and Roman Geography, ed. W. Smith.  London, Walton & Maberly, 1854-57.
Perkins Reference -- DE25 .S66 1854 
A very detailed treatment of classical places based on their descriptions in ancient sources; not an atlas, but useful for citations of ancient authors regarding places, with some illustrations.