http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Soil colors of the continental United States
1 map : color ; 60 x 92 cm, folded to 15 x 23 cm.
"National Cooperative Soil Survey"--Back panel.
Soils colors of the continental United States
Program aid (United States. Department of Agriculture) ; no. 2263