United states earthquakes 1947 / by Leonard M. Murphy.
Murphy, Leonard M.
United states earthquakes 1947 / by Leonard M. Murphy. - Washington. : United States Coast and Geodetic Survey - 66 p. - Serial; no. 730 .
United states earthquakes 1947 / by Leonard M. Murphy. - Washington. : United States Coast and Geodetic Survey - 66 p. - Serial; no. 730 .