Exhibit 1.1(b) Nuveen Unit Trusts, Series 91 Trust Indenture and Agreement Dated: May 15, 2000 This Trust Indenture and Agreement by and between John Nuveen & Co. Incorporated, as Depositor and The Chase Manhattan Bank, as Trustee, sets forth certain...Trust Indenture and Agreement • May 15th, 2000 • Nuveen Unit Trusts Series 91
