The U. S. Naval Oceanographic Office has an active program of measuring gravity at sea and on land, which includes the establishment of a World Gravity Base Network and of operational check ranges for testing gravity meters. In addition to these activities it collects and riles all published or unpublished gravity data that it can obtain from the literature or private sources.Collected data is entered on punched cards in a standard format which includes the security classification of the observation, its latitude, longitude, and either height in meters (on land) or sounding in fathoms (at sea). Then are punched the observed gravity data corrected to the ‘Potsdam’ datum, as adopted by the IUGG, an evaluation of the accuracy of the measurement, the free‐air anomaly according to the 1930 International Gravity Formula, and an evaluation of the accuracy of the free air anomaly. Then follow the year, month, day, and hour of the observation, the type of instrument used, and the mode of observation (whether land, sea surface, submarine, or underwater). The base station used, the correction to the reported base value to reduce it to the ‘Potsdam’ system, the source of the data, and a file number complete the information recorded. Complete base station descriptions with adopted gravity values are maintained in a subsidiary file, and a second subsidiary file contains references to and summaries of the sources from which the data were obtained. The file number designates the geographic 10‐minute square in which the observation