Magnetic results from Huancayo Observatory, Peru, 1945-1947Carnegie Institution of Washington. Dept. of Terrestrial Magnetism, P. G. Ledig, Giesecke, A. A., Jr., W. C. Parkinson, W. E. Scott, Ella Balsam · First published 1951Open the Tome
Magnetic results from Watheroo Observatory, Western Australia, 1945-1947Carnegie Institution of Washington. Dept. of Terrestrial Magnetism, Australian Commonwealth Bureau of Geology, Geophysics, and Mineral Resources, W. C. Parkinson, F. W. Wood, W. E. Scott, Ella Balsam · First published 1951Open the Tome
Magnetic results from Huancayo Observatory, Peru, 1922-1935Carnegie Institution of Washington. Dept. of Terrestrial Magnetism, H. F. Johnston, A. G. McNish, S.E. Forbush, W. E. Scott, Ella Balsam, P. G. Ledig · First published 1948Open the Tome
Magnetic results from Huancayo Observatory, Peru, 1936-1944Carnegie Institution of Washington. Dept. of Terrestrial Magnetism, H. F. Johnston, A. G. McNish, S.E. Forbush, W. E. Scott, Ella Balsam, P. G. Ledig · First published 1948Open the Tome
