The following print resources are essential for further study in numismatics.
Roman Numismatics and Portraiture
Greek Numismatics and Portraiture
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The website for the American Numismatic Society is a good starting point for numismatic research. Some of their collection is accessible online, and there are many links to further resources online.
The Münzkabinett of the Staatliche Museen zu Berlin is one of the largest physical numismatic collections in the world, and their online collection is equally impressive, featuring a broad range of ancient through modern coinage. The coins are well-documented, and the well-designed site is a great source for any numismatic research.
The Princeton University Numismatic Collection features a significant number of ancient Greek and Roman, medieval European, and East Asian coinage.
This is a good source on Roman numismatics, especially with the descriptions of mint marks, countermarks, and themed collections.
Austin College's collection comprises of a broad selection of Roman coins.
General Ancient History and Literature Sites
The following online resources provide articles that have been linked from index terms for coins from the University of Virginia Art Museum.
This is the definitive online source for Roman imperial and Byzantine biographies. Essays are written by experts in the field and peer-reviewed for quality and accuracy before published.
Livius.org is a great all-around resource for ancient Mediterranean and Near Eastern history, particuarly Greek and Roman. Topics include political and military events, biographies, kingdoms, and geographic regions.
Theoi.com is great source for Greek mythology.