[Figure1]

Figure 1. Annual global marine reports after duplicate elimination (curve) for COADS Release 1 through 1979, continued by Release 1a through 1992. Horizontal lines span the time periods for data now being collected and digitized (World War I and II; Arctic) or proposed for future digitization, with the approximate numbers of reports shown in millions (M) or thousands (K). Labelled ticks along the upper horizontal axis mark the starting years for Release 1a, and those planned for Releases 1b (1947) and Release 2 (1854, or earlier).



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