EX-4.A1
from 10-K
12 pages
Colorado Interstate Gas Company and Harris Trust and Savings Bank, Trustee First Supplemental Indenture Dated as of June 27, 1997 to Indenture Dated as of June 27, 1997 $100,000,000 6.85% Senior Debentures Due June 15, 2037
12/34/56