Antonio Guimaraes Modification of Mean Projection Plane of the Multiplex Apparatus of the "Diretoria de Hidrografia e Navegaçao” and its effects on photogrammetric Restitution Operations applied to Cartography, of Lieutenant-Commander Alberto dos Santos Franco PDF (English)
J. Th. Verstelle The need for Coordination of geographical Grids of the World, in relation to Position-fixing by Radionavigation Systems PDF (English)
Stijepo Kotlaric Unification of Systems for keeping up to date Navigational Publications printed as volumes, avoiding the writing or erasing of corrections, or the pasting on of Coupons PDF (English)
Friedrich Schüler On the Accuracy of Configuration of Sea Bottom Profiles with high Frequency Echo Sounders PDF (English)
Heinz Gerhard Gabler Gresky Subjective Aural Result or Objective Visual indication of Radio Direction Finding ? PDF (English)
