The Department shall constitute the official library of the State of Oklahoma. The Department shall have custody of all books, documents, facsimiles, films, maps, manuscripts, pamphlets, papers, charts, archives, periodicals, records, and any other materials or objects now in its possession or that may be acquired. No department or institution of state government, except institutions of higher learning, museums and the Oklahoma Historical Society, shall establish a library without prior approval of and except in cooperation with the Department; provided that this provision is not to prevent a state agency from having the minimal necessary and frequently used office copies of reference works, catalogs, legal reports or technical publications required to conduct its daily operations.