KEYSPAN CORP

175 EAST OLD COUNTRY ROAD, HICKSVILLE NY 11801, 5167556650
NATURAL GAS DISTRIBUTION

1999 SEC Filings

KEYSPAN CORP, 424B3, 1999-12-06
KEYSPAN CORP, S-3, 1999-12-02
KEYSPAN CORP, 8-K, 1999-12-02
KEYSPAN CORP, 10-Q, 1999-11-12
KEYSPAN CORP, 8-K, 1999-11-05
KEYSPAN CORP, 8-K, 1999-09-16
KEYSPAN CORP, 424B3, 1999-09-01
KEYSPAN CORP, 10-Q, 1999-08-16
KEYSPAN CORP, 8-K, 1999-06-22
KEYSPAN CORP, S-8, 1999-05-24
MARKETSPAN CORP, 8-K, 1999-05-20
MARKETSPAN CORP, 10-Q, 1999-05-14
MARKETSPAN CORP, U-3A-2, 1999-04-16
MARKETSPAN CORP, DEFA14A, 1999-04-07
MARKETSPAN CORP, DEF 14A, 1999-04-07
MARKETSPAN CORP, 8-A12B, 1999-03-30
MARKETSPAN CORP, 8-K, 1999-03-30
MARKETSPAN CORP, 10-K, 1999-03-29
MARKETSPAN CORP, PRE 14A, 1999-03-23
MARKETSPAN CORP, 8-K, 1999-02-12
MARKETSPAN CORP, 8-K, 1999-02-04


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