%0 Map %0 U.S. Federal Government Document %0 Print %A Barnes, David F. (David Fitz), 1921- %E Geological Survey (U.S.) %I U.S. Geological Survey %D 1977 %C Reston, Va. %G English %B Geophysical investigations (Geological Survey (U.S.)) ; %T Bouguer gravity map of Alaska