"The Aleutian Trench" compiled by Harold W. Murray of the Coast and Geodetic
Survey and published in the "Bulletin of the Geological Society of America,"
Vol. 56, p. 757-782, Plate I. Soundings for making these profiles were
acquired between 1925 and 1939 by following systematic tracklines from the U. S.
West Coast to the Aleutians for hydrographic surveying operations.