In 1996/97, Puerto Rico's public libraries contained about 609,391 volumes and had a combined circulation of 479,133. The University of Puerto Rico Library at Rio Piedras held 1,804,010 books in 2003; the library of the Puerto Rico Conservatory of Music, in San Juan, has a collection of music written by Puerto Rican and Latin American composers. La Casa del Libro, also in San Juan, is a library-museum of typographic and graphic arts. There were some 50 museums in Puerto Rico in 2003, among them the Museo de Arte de Ponce (Luis A. Ferre Foundation) has paintings, sculptures, and archaeological artifacts, as well as a library. The Marine Station Museum in Mayagüez exhibits Caribbean marine specimens and sponsors research and field trips.