0000893220-00-000050 DEF 14A 1 20000301 20000120 AMERISOURCE DISTRIBUTION CORP 0000855042 5122 232546940 DE 0930 DEF 14A 34 000-20485 510299 300 CHESTER FIELD PWKY MALVERN PA 19355 6102964480 300 CHESTER FIELD PKWY MALVERN PA 19355 ALCO HEALTH DISTRIBUTION CORP /DE/ 19920703 AHSC HOLDINGS CORP 19920325 DEF 14A 1 000089322000000050-001-seq1-def-14a.txt DEFINITIVE PROXY STATEMENT AMERISOURCE HEALTH CORP