1980-02-06 /BB-4170H-SM/01/sources/l20sca.ccl 1980-02-06 /BB-J713A-BM/01/4-sources/l20sca.ccl 1980-02-12 /BB-K911B-SM/01/sources/l20sca.ccl 1982-11-22 /bb-d868e-bm_tops20_v41_2020_dist_1of2/01/4-1-sources/l20sca.ccl