SAMPLE:
100~Philosophy~and~Psychology:10

960~History~of~Africa:16
970~History~of~North~America:667
970.004~Native~Americans:57
971~Canada:7
972~Central~America:56
973~United~States:190
973.3~American~Revolution:98
973.7~Civil~War:25
974~Northeastern~US:59
975~Southeastern~US:43
976-977~Central~US:45
978-979~Western~US:28
980~History~of~South~America:29
990~History~of~Other~Areas:15