gale_-_science_and_its_times_vol_01_(2000_bc_to_ad_699)
gale_-_science_and_its_times_vol_02_(700_to_1449)
gale_-_science_and_its_times_vol_03_(1450_to_1699)
gale_-_science_and_its_times_vol_04_(1700_to_1799)
gale_-_science_and_its_times_vol_05_(1800_to_1899)
gale_-_science_and_its_times_vol_06_(1900_to_1949)
gale_-_science_and_its_times_vol_07_(1950_to_present)