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Subclass PM
| PM1-9021 | Hyperborean, Indian, and artificial languages | ||
| PM1-94 | Hperborean languages of Arctic Asia and America | ||
| PM101-2711 | American languages (Aboriginal) | ||
| PM231-355 | American languages of British North America | ||
| PM(401)-501 | American languages of the United States (and Mexico) | ||
| PM549-2711 | Special languages of the United States and Canada (alphabetically) | ||
| PM3001-4566 | Languages of Mexico and Central America | ||
| PM5001-7356 | Languages of South America and the West Indies | ||
| PM7801-7895 | Mixed languages | ||
| PM7831-7875 | Creole languages | ||
| PM8001-8995 | Artificial language—Universal languages | ||
| PM8201-8298 | Esperanto | ||
| PM8999 | Picture languages | ||
| PM9001-9021 | Secret languages | ||
