Columbia subject headings:
Harvard subject headings:
Agriculture--Bibliography--Union lists.
Agriculture--United States--Bibliography--Union lists.
Agriculture--United States--History--Sources--Bibliography--Union lists.
Early printed books--Union lists.
Union catalogs--Pennsylvania--Philadelphia.
Princeton subject headings:
Agriculture--Bibliography--Union lists.
Agriculture--United States--Bibliography--Union lists.
Agriculture--United States--History--Sources--Bibliography--Union lists.
Early printed books--Union lists.
Union catalogs--Pennsylvania--Philadelphia.