He studied mathematics, astronomy, political economy, zoology, archaeology and numismatics. His other diverse interests included ethnology, archaeology, numismatics, and astronomy. As a result, surviving Dahlonega coinage is today highly prized in American numismatics. Other interests included geology, photography, archaeology and numismatics. Non-literary sources such as archaeology, epigraphy, and numismatics are also useful for reconstructing his reign. The company buys and sells bullion, numismatics, semi-numismatics, rare coins and currency. The collecting of elongated coins is a branch of numismatics. Epigraphy overlaps other competences such as numismatics or palaeography. Casino chip collecting is a part of numismatics, more specifically as specialized exonumia collecting. The Rumyantsev Museum was split into the departments of painting, engraving, numismatics, and archaeology. There is no generally recognized term (e.g. numismatics for currency collecting) for magnet collecting. Banknote collecting, or notaphily, is a slowly growing area of numismatics. They are also used in numismatics and stamp collecting. The museum also has a collection of jewelry, weapons, statuary, numismatics and glassware. He is also interested in Roman numismatics.