Land magnetic observations Samuel Jackson Barnett, Louis Agricola Bauer, J. A. Fleming, W. J. Peters, H. U. Sverdrup, Carnegie Institution of Washington. Department of Terrestrial Magnetism
Land magnetic and electric observations, 1918-1926 Land magnetic and electric observations, 1918-1926 Carnegie Institution of Washington. Dept. of Terrestrial Magnetism, H. W. Fisk, H. U. Sverdrup
Land magnetic observations Louis Agricola Bauer, J. A. Fleming, W. J. Peters, Samuel Jackson Barnett, H. U. Sverdrup, Carnegie Institution of Washington. Department of Terrestrial Magnetism
