http://pec.lib.wvu.edu/record/P1900019801980 apple spray program costs.<p> Mimeograph of typescript. West Virginia University Cooperative Extension Service memorandum to West Virginia fruit grower attached.</p>West Virginia University. Cooperative Extension Service.Spraying and dusting in agriculture--West Virginia--Costs.Apples--Diseases and pests--Control--West Virginia--Costs.14256