"Farm economics (University of Pennsylvania)"@en . "Farm and family economics"@en . . . "Farm economics (University Park, Pa.)"@en . "Farm economics"@en . "Farm economics" . . . . . . . . . . . . . . . . . . . . . . "Periodicals"@en . . . "University of Pennsylvania. Agricultural Extension Service." . . . . "University of Pennsylvania. Agricultural Economics Extension." . .