L. Slaucitajs A short historical sketch of Hydrographic Work of the Latvian Coast and to seaward, and the present state of the Charting Thereof PDF
T. J. Richmond Diagram for position finding by long distance bearings and for finding the bearing of one point from another PDF
O. W. Torreson The determination of geographical position for scientific observations at sea and especially in connection with magnetic work PDF
Short note on the measurement of the acceleration of gravity at sea and on an Italian gravimetric cruise in the Tyrrhenian Sea PDF
