http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Numbers of ducks in the United States -- Breeds of ducks -- Duck farming -- Selecting and mating -- Incubation -- Brooding -- Feeding -- Preparing ducks for market -- Marketing duck eggs.
Farmers' bulletin (United States. Department of Agriculture) ; no. 697