| Northern Europe | Denmark, Finland, Føroyar, Great Britain, Iceland, Ireland, Norway, Sweden |
| Middle Europe | Austria, Belgium, Czechoslovakia, Germany, Netherlands, Poland, Switzerland |
| Southwestern Europe | France, Spain |
| Southeastern Europe | Greece, Italy, Romania, Yugoslavia |
| Eastern Europe | Belarus, Baltic States, Central European Russia, East European Russia, North European Russia, Northwest European Russia, Ukraine |
| Siberia | Altay, Buryatiya, Irkutsk, Krasnoyarsk, West Siberia, Yakutiya |
| Russian Far East | Amur, Kamchatka, Khabarovsk, Kuril Is., Primorye, Sakhalin |
| Caucasus | North Caucasus, Transcaucasus |
| Western Asia | Turkey |
| Eastern Asia | Japan |
| Subarctic America | Aleutian Is., Alaska, Greenland, Nunavut, Yukon |
| Western Canada | Alberta, British Columbia, Manitoba, Saskatchewan |
| Eastern Canada | Labrador, New Brunswick, Newfoundland, Nova Scotia, Ontario, Prince Edward I., Québec |
| Northwestern U.S.A. | Colorado, Idaho, Montana, Oregon, Washington, Wyoming |
| North-Central U.S.A. | Minnesota, Wisconsin |
| Northeastern U.S.A. | Connecticut, Maine, Massachusetts, Michigan, New Hampshire, New Jersey, New York, Ohio, Pennsylvania, Rhode Island, Vermont, West Virginia |
| Southwestern U.S.A. | California |
| South-Central U.S.A. | New Mexico |
| Southeastern U.S.A. | Maryland, North Carolina, Virginia, District of Columbia |