http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Climatic provinces and plant growth regions of the United States
Important soil regions and plant growth regions of the United States
3 maps : color ; 74 x 79 cm. or smaller.
Contents: 1. .--2. Climate provinces and plant growth regions of the United States.--3. Important soil regions and plant growth regions of the United States.
At head of title: U.S. Department of Agriculture.
Scale 1:7,000,000 or approx. 111 miles to the inch.