The library of the Survey now contains more than 25,000 volumes, and is
rapidly growing by means of exchanges. It is found necessary to purchase
but few books. The librarian, Mr. C.C. Darwin, has a corps of assistants
engaged in bibliographic work. It is proposed to prepare a catalogue of
American and foreign publications upon American geology, which is to be a
general authors' catalogue. In addition to this, it is proposed to publish
bibliographies proper of special subjects constituting integral parts of
the science of geology.