None of the Russian explorers, regrettably, report verbally on the deserted sites or ruins. But their registration and location of many villages that have since become "dead" is of much historical as well as anthropological value. [Illustration: FIGURE 13.--World map] Of later and particularly American authors who gave attention to the location of the western Eskimo settlements, the foremost is E. W. Nelson. Beginning in 1877 with the St. Michael Island and ending with the cruise of the _Corwin_ in 1881, Nelson made trips down the coast to the Kuskokwim, up the Yukon to Anvik, over the Bering Sea, the St. Lawrence Island and parts of the Chukchee Peninsula, and finally, with the _Corwin_, along the northern coasts to Point Barrow. And these journeys were devoted largely to biological and ethnological observations and collections, the latter including the location of the western Eskimo habitations of that time. His locations are given on the accompanying map (fig. 15) taken from his classic memoir, "The Eskimo about Bering Strait," published in 1900 in the Eighteenth Annual Report of the Bureau of American Ethnology. This memoir contains a section of "Ruins" (pp. 263-266), a brief account of the recently dead villages on St. Lawrence Island (p. 269), and an instructive section on Eskimo burials (pp. 310-322). Nelson brought also the first more substantial collection of Eskimo crania. The next deserving man in these connections is Ivan Petrof. Of Russian-American extraction, Petrof was charged in 1880 with the census enumeration of the natives in Alaska, and he later published[60] a valuable report on his work, together with detailed demographic data and a map on which are given all the living settlements of his time. Nelson's map is partly based on Petrof's data. Since Nelson and Petrof but little has been done in this field. But the maps of these two observers have been utilized more or less by the map makers of the United States Coast and Geodetic Survey, the Geological Survey, and other Government agencies concerned with Alaska. The result is that some of these charts are exceptionally useful to the anthropological explorer in Alaska; nevertheless the data they carry are incomplete and the locations or names are not always exact, a good many of the villages shown are now dead, and old ruins, as usual, have received no attention. [Illustration: FIGURE 14.--Dall's map of the distribution of the tribes of Alaska and adjoining territory, 1875]