The first Geological Survey record setting forth the history of the boundaries of the United States and the several States and Territories was prepared by Henry Gannett, assisted by Franklin G. Butterfield, and was published as Bulletin 13 of the Geological Survey in 1885. The second edition, revised and enlarged by Henry Gannett, was published as Bulletin 171 in 1900. The third edition, also revised by Gannett, was published as Bulletin 226 in 1904. A revision and enlargement of Bulletin 226, which included additional matter incidentally connected with boundaries, was -prepared by Edward M. Douglas and issued in 1923 as Bulletin 689. It was again revised by Douglas in 1930 as Bulletin 817.The present bulletin, prepared in 1964, is a revision of the 1932 edition of Bulletin 817. The revisions include clarification and modification of descriptions of certain boundaries, some of which are based on court decisions or international agreements; they also include more accurate figures for certain statistical data and numerous minor additions and deletions as appropriate.