0000797468-00-000021 DEF 14A 1 19991231 20000321 OCCIDENTAL PETROLEUM CORP /DE/ 0000797468 1311 954035997 DE 1231 DEF 14A 34 001-09210 574857 10889 WILSHIRE BLVD LOS ANGELES CA 90024 3102088800 10889 WILSHIRE BOULEVARD LOS ANGELES CA 90024 DEF 14A 1 000079746800000021-001-seq1-def-14a.txt DEFINITIVE PROXY STATEMENT