Washington: United States National Museum, Bulletin 50, 1901-1950. A very good complete set in 11 volumes. Mixed bindings: Parts I - VIII bound in half red leather over marbled boards; Parts IX, X, and XI in original wrappers. Ex-library with call numbers taped to spine, pockets and bar code on ffeps. A Descriptive Catalog of the Higher Groups, Genera, Species, and Subspecies of Birds Known to Occur in North America, from the Arctic Lands to the Isthmus of Panama, the West Indies and Other Islands of the Caribbean Sea, and the Galapagos Archipelago. Complete sets are increasingly scarce.