Maps
USDA Hardiness Zone Maps 1990 and 2006
Arbor Day Foundation
USDA Hardiness Zone Maps 2012
USDA ARS Oregon State
Dominant Soil Orders of the United States
Terrestrial and Marine Ecosystems of the US
Terrestrial Ecosystems of the Conterminous US
Soil Moisture Regimes of the Contiguous US
Level III Ecosystems of the Continental United States
Ecoregions of the US, RG Bailey
USDA Forest Service
Geomorphic/Physiographic Provinces, Topographic Textures and Generalized Geology by Age
30-yr Normal Minimum Temperature: Annual
PRISM OSU
30-yr Normal Maximum Temperature: Annual
PRISM OSU
30-yr Normal Precipitation: Annual
PRISM OSU
