http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Revised estimates of heritability of economic characteristics in beef cattle
Bradford Knapp, Jr., and R. T. Clark, United States Department of Agriculture.
Reprinted from Journal of animal science, Vol. 9, No. 4, November, 1950.