Prepared and published by the Defense Mapping Agency. Depths shown by isolines and soundings. Relief shown by hachures and spot heights. "From various sources to 1961." "Copyright 1996 by the United States Government. No copyright claimed under Title 17 U.S.C." "Soundings in meters." "Sheet no. 29018." This map is part of a collection of scanned and georeferenced nautical charts produced by the National Geospatial-Intelligence Agency (NGA). United States. Defense Mapping Agency. (1996). Antarctica, Porpoise Bay to West Ice Shelf (Raster Image). LandInfo. Available at: https://purl.stanford.edu/wz830ns8579 This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.