; limitation on number The Superintendent shall carry out this section in accordance with regulations promulgated under this subchapter. Such regulations shall provide for an adequate number and distribution of Selective Depository Libraries in order to meet the information needs of the public, and shall not prevent the designation of at least one Selective Depository Library in each congressional district. 1745. Regional Depository Libraries (a) Regional Depository Libraries described A library which is designated as a Federal Depository Library may, at its request, be designated as a Regional Depository Library if the Library meets the following requirements: (1) The Library agrees to receive its information dissemination products from the Superintendent of Documents for purposes of this subchapter in tangible form, except that the Library may decline to receive an IDP in tangible form if the authenticated IDP is available through the online repository under subchapter C. (2) The Library provides access to all IDPs under this subchapter regardless of form or format. (3) The Library coordinates and collaborates with Selective Depository Libraries to maintain access to the collection of IDPs available within the region, including IDPs deposited prior to the library’s designation as a Federal Depository Library under this subchapter, and may do so by housing some of its collection at one or more Selective Depository Libraries pursuant to an agreement with such Selective Depository Library. (4) The Library agrees to provide services under this subchapter to Selective Depository Libraries under agreements facilitated by the Superintendent of Documents, in accordance with regulations promulgated under this subchapter. (5) A Senator makes a recommendation to the Superintendent that the Library should be designated as a Regional Depository Library. (b) Withdrawal of collection of tangible IDPs A Regional Depository Library may withdraw from its collection an IDP which is in tangible form if— (1) the authenticated IDP