; and (B) in any tangible format held under this subchapter. (2) The library shall ensure that a member of the library’s staff who is knowledgeable about the services described in paragraph (1) is reasonably available to assist patrons with the provision of such services. (3) The library shall meet such other additional requirements as the Superintendent may establish by regulations promulgated under this subchapter. (b) Maintenance and removal of deposited IDPs In addition to the requirements described in subsection (a), each library designated as a Federal Depository Library under this subchapter shall maintain the information dissemination products furnished to the library by the Superintendent under this chapter (regardless of form or format) in accordance with such policies as the Superintendent may establish, and may remove any such products only in accordance with such policies as the Superintendent may establish (consistent with the requirements of section 1744 in the case of Selective Depository Libraries and the requirements of section 1745 in the case of Regional Depository Libraries). (c) Management of IDPs in tangible form Any information dissemination product which is deposited with a Federal Depository Library under this subchapter in tangible form remains the property of the United States Government unless the IDP is donated to the Library under section 1743(b). (d) Regulations The Superintendent shall establish the requirements of this section in accordance with regulations promulgated under this subchapter. Such regulations shall encourage participation by a broad and diverse group of libraries, and may not establish a limit on the number of libraries which may be designated under this section. 1743. Services available for depository libraries (a) Optional digital deposit (1) In general At the option of the Library, a Federal Depository Library may receive directly from the Superintendent of Documents deposits in electronic format of information dissemination products included in the national