@book{numophylacium-head-guide-principal-coins,
  title = {A Guide to the Principal Gold and Silver Coins of the Ancients},
  author = {Barclay V. Head},
  year = {1881},
  language = {English},
  url = {https://numophylacium.com/works/head-guide-principal-coins/},
  pdf = {https://numophylacium.com/library/guidetoprincipal00brituoft/guidetoprincipal00brituoft.pdf},
  note = {Digitized reference record in Numophylacium Graecum; source archive.org guidetoprincipal00brituoft}
}