P. De Vanssay De Blavous Use of the properties of the arc containing an angle (position line) in navigation and in hydrographic surveys PDF (English)
L. Tonta Notes on nautical cartography: Orthodromic charts for fixing the position by radiogoniometric bearings PDF (English)
P. Collinder A summary of hydrographical results obtained during an arctic cruise in 1929 PDF (English)
Description of the portable magnetometer of the Ordnance Survey built by the Cambridge Instrument Co., Ltd. PDF (English)
