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- W775601339 abstract "The worldwide coverage of the earth by land, sea, and aircraft magnetic surveys since the beginning of the 20th century is shown on three world maps for surface surveys spanning the periods of 1900-1930, 1930-1955, and 1955-1967, respectively, on a fourth map for ship-towed magnetometer surveys performed after 1956, and on a fifth map for 1953-1966 airborne survey data. The technique used, involving a position plotting of each measurement with a microfilm plotter, results in the appearance of heavily surveyed regions as completely darkened areas. The coverage includes measurements at about 100,000 land stations, airborne measurements at over 90,000 points, and marine measurements at over 25,000 points. The marine measurements cover over 1,000,000 km of trackline." @default.
- W775601339 created "2016-06-24" @default.
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- W775601339 date "1971-01-01" @default.
- W775601339 modified "2023-09-27" @default.
- W775601339 title "Coverage by land, sea, and airplane surveys, 1900-1967." @default.
- W775601339 hasPublicationYear "1971" @default.
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