title: Physicians and the development of scientific agriculture, empiricism to science 1731-1863.
mesh_terms: D000383:Agriculture; D049671:History, 18th Century; D049672:History, 19th Century; D049673:History, 20th Century; D010414:Pennsylvania; D010820:Physicians / Q000266:history*; D012586:Science / Q000266:history; D014481:United States