Regulations concerning the organisation of the Hydrographic Service of the United States of Brazil PDF
J. H. Hayes ECHO SOUNDING - XII: A. Report on sea trials of deep water echo sounding gear in H.M.S. Challenger and Ormonde PDF
ECHO SOUNDING - XII: B. Echo sounding in motor boats. A description of the British Admiralty super-sonic shallow water echo sounding gear PDF
Erratum & Addendum to Hydrograhic Review, Vol X, N° 1, May 1933, Slope corrections for echo soundings PDF
Wilke Station pointer with station holders for hydrographic surveying during protracted use of the same terrestrial landmarks PDF
