http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Indices of agricultural and food production for Europe and the U.S.S.R
average 1961-65 and annual 1969 through 1978
Economics, Statistics, and Cooperatives Service.
Supersedes ERS-608 and all previous indices.
Statistical bulletin (United States. Department of Agriculture) ; no. 620