Grolier Encylopedia of Knowledge (America encyclopedia Grolier Incorporated Danbury, Connecticut, 1993)
Volume-1, Volume-2, Volume-3, Volume-4, Volume-5, Volume-6, Volume-7, Volume-8, Volume-9, Volume-10, Volume-11, Volume-12, Volume-13, Volume-14, Volume-15, Volume-16, Volume-17, Volume-18, Volume-19, Volume-20
Keywords: Encylopedia