2 U.S. Code § 6510
2 U.S. Code § 6510 is about Materials, supplies, and fuel payments from Senate contingent fund. It is under Subchapter I (General) of Chapter 65 (Senate Officers and Administration) of Title 2 (The Congress) of the Code.
Payments from the contingent fund of the Senate for materials and supplies (including fuel) purchased on and after July 8, 1935, through the Administrator of General Services shall be made by check upon vouchers approved by the Committee on Rules and Administration of the Senate.