Lorber Monogram 181 (nmo:Monogram)
- URI
- http://numismatics.org/pco/symbol/monogram.lorber.181
- Monogram 181 from Catharine C. Lorber, Coins of the Ptolemaic Empire, Vol. I (2018). The monogram contains Ο and Ε as identified by Peter van Alfen. (en)
- Ο and Ε
- http://nomisma.org/id/greek_numismatics
- http://nomisma.org/id/coins_ptolemaic_empire
