Except as otherwise provided in section 1318 of title 44, the publications of the United States Geological Survey shall consist of geological and economic maps, illustrating the resources and classification of the lands, and reports upon general and economic geology and paleontology. All special memoirs and reports of said survey shall be issued in uniform quarto series if deemed necessary by the director, but otherwise in ordinary octavos. Three thousand copies of each shall be published for scientific exchanges and for sale at the price of publication, and all literary and cartographic materials received in exchange shall be the property of the United States and form a part of the library of the organization; and the money resulting from the sale of such publications shall be covered into the Treasury of the United States, under the direction of the Secretary of the Interior.