cosponsored by U.S. Geological Survey, Agricultural Research Service, Soil Conservation Serivce, Reston, Virginia, February 5-8, 1990 ; compiled by Madge Ertel
Kolichestvennye metody v sovetskoĭ i amerikanskoĭ istoriografii : materialy sovetsko-amerikanskikh simpoziumov v g. Baltimore, 1979 g. i g. Talline, 1981 g.