| Class |
Region |
Subregion |
Period |
| A |
African |
|
|
| Aa |
African |
|
Prehistoric |
| Ae |
African |
|
Ancient |
| Ai |
African |
|
Islamic |
| Am |
African |
|
Colonial |
| At |
African |
|
20th cent. |
| C |
Americas |
|
|
| Cc |
Americas |
|
Pre-Columbian |
| Cg |
Americas |
|
Native American |
| Cm |
Americas |
|
Colonial |
| Cp |
Americas |
|
18th cent. |
| Cr |
Americas |
|
19th cent. |
| Ct |
Americas |
|
20th cent. |
| E |
Early Western World |
|
|
| Ea |
Early Western World |
Prehistoric Europe |
|
| Ec |
Early Western World |
Ancient Near Eastern |
|
| Eg |
Early Western World |
Ancient Egyptian |
|
| Ei |
Early Western World |
Aegean |
|
| Ek |
Early Western World |
Ancient Greek |
|
| Em |
Early Western World |
Etruscan |
|
| Er |
Early Western World |
Roman |
|
| G |
European |
|
|
| Ga |
European |
|
Early Christian |
| Gb |
European |
|
Byzantine |
| Ge |
European |
|
Medieval |
| Gi |
European |
|
Islamic |
| Gk |
European |
|
Renaissance |
| Gm |
European |
|
Baroque-Rococo |
| Gp |
European |
|
18th century |
| Gs |
European |
|
19th century |
| Gt |
European |
|
20th century |
| I |
Middle Eastern |
|
|
| Ig |
Middle Eastern |
|
Islamic |
| It |
Middle Eastern |
|
Modern |
| M |
Asian |
|
|
| O |
Asian |
Chinese |
|
| Oa |
Asian |
Chinese |
Prehistoric |
| Oc |
Asian |
Chinese |
Bronze Age (1523-480 BCE) |
| Og |
Asian |
Chinese |
Iron Age (480 BCE - 220 CE) |
| Ok |
Asian |
Chinese |
Buddhist Period (220-900) |
| Om |
Asian |
Chinese |
Naturalist Period (900-1300) |
| Op |
Asian |
Chinese |
Literati Period (1300-1912) |
| Ot |
Asian |
Chinese |
Modern Period (1912-) |
| P |
Asian |
Indian |
|
| Pb |
Asian |
Indian |
Pre-Buddhist (pre 322 BCE) |
| Pe |
Asian |
Indian |
Buddhist Period (322 BCE - 600 CE) |
| Pg |
Asian |
Indian |
Medieval Period (600-1100) |
| Pk |
Asian |
Indian |
Late Medieval Period (1100-1526) |
| Pm |
Asian |
Indian |
Mughal Period (1526-1800) |
| Pp |
Asian |
Indian |
Colonial Period |
| Pt |
Asian |
Indian |
Modern |
| Q |
Asian |
Indonesian |
|
| Qa |
Asian |
Indonesian |
Pre-Buddhist (roughly pre-200 CE) |
| Qd |
Asian |
Indonesian |
Buddhist (roughly 200-900) |
| Qg |
Asian |
Indonesian |
Post-Buddhist (roughly 900-) |
| Qm |
Asian |
Indonesian |
Colonial |
| Qt |
Asian |
Indonesian |
Modern |
| R |
Asian |
Japanese |
|
| Ra |
Asian |
Japanese |
Prehistoric/Protohistoric |
| Re |
Asian |
Japanese |
Early Historic or Buddhist period (552-1185) |
| Rm |
Asian |
Japanese |
Medieval (1185-1573) |
| Rr |
Asian |
Japanese |
Early Modern (1573-1868) |
| Rt |
Asian |
Japanese |
Modern (1868-) |
| S |
Asian |
Korean |
|
| Sa |
Asian |
Korean |
Pre-Buddhist (pre ca.57 BCE) |
| Sf |
Asian |
Korean |
Buddhist (ca.57 BCE - 668 CE) |
| Sk |
Asian |
Korean |
Koryu (918-1392) |
| Sp |
Asian |
Korean |
Yi (1392-1910) |
| St |
Asian |
Korean |
Modern |
| T |
Asian |
Siberian |
|
| Ua |
Asian |
Southeast Asian |
|
| Ug |
Asian |
Southeast Asian |
Pre-Buddhist (roughly pre-200 CE) |
| Uk |
Asian |
Southeast Asian |
Buddhist (roughly 200-900) |
| Um |
Asian |
Southeast Asian |
Post-Buddhist (roughly 900-) |
| Up |
Asian |
Southeast Asian |
Colonial |
| Ut |
Asian |
Southeast Asian |
Modern |
| Z |
Oceanic |
|
|
| Za |
Oceanic |
Australian |
|
| Zb |
Oceanic |
Australian |
Aboriginal |
| Ze |
Oceanic |
Australian |
Colonial |
| Zh |
Oceanic |
Australian |
Modern |
| Zm |
Oceanic |
Melanesian |
|
| Zo |
Oceanic |
Micronesian |
|
| Zp |
Oceanic |
Polynesian |
|
