English: Consists of a wide variety of materials relating to an effort to map ocean floors carried out by the Lamont-Doherty Earth Science Observatory of Columbia University. This work was accomplished by geologist Bruce C. Heezen and oceanographer/cartographer Marie Tharp. The materials included maps, preliminary drawings, earth science data, precision depth recordings, scientific and technical reports, papers, correspondence, cruise logbooks, printing masters, reproducibles, and globes. Register in Geography and Map Division Reading Room. Available also through the Library of Congress Web site as a raster image.