Anna Isabel Jonas and Eleanora Frances Bl Knopf—Maryland/Pennsylvania Geological Surveys—Stratigraphy of the metamorphic rocks of southeastern Pennsylvania and Maryland.
Oscar Edward Meinzer—USGS—A map of Pleistocene lakes in the basin-and-range province and its interpretations.
View all talks from 1921 | Go to Meeting number 356 | Go to Meeting number 358 |