This request concerns information collection requirements related to the use of Government sources of supply by contractors. DFARS clause 252.251-7000 requires contractors to provide certain documentation with Federal Supply Schedule orders to verify their authorization to purchase from Government supply sources.
The latest form for Defense Federal Acquisition Regulation Supplement Part 251, Use of Government Sources by Contractors, and related clause at 252.251 expires 2021-01-31 and can be found here.