G. W. LaCroix, L. P. Murdock The Use and Evaluation of Hi-Fix in a Canadian Hydrographic Coastal Survey PDF
P. O. Fagerholm, A. Thunberg Determination of Fixed Errors in Navigational (and Hydrographic) Decca Chains PDF
R. C. A. Edge, P. H. Kenney Report of I.A.G Special Study Group No.19 on Electromagnetic Distance Measurement, 1960–1963 PDF
