W. Denne
Unknown Author
George Graydon
Langton, John
W. N. McFarland
Karl Kreil
Sabine, Edward Sir
Heinrich Wilhelm Dove
Peter Barlow
N. V. Kulanin
L. R. Newitt
John Lorimer
L. Mascheroni
Charles H. Brown, F.R.S.G.S.
U.S. Coast and Geodetic Survey.
Argentina. Servicio Meteorológico Nacional.
Christopher Hansteen