«The tide goes up ... and the observation has to be made. Geo-Hydrographic. Mission Guinea, Rio de Buba, April 1955»
«The tide goes up ... and the observation has to be made. Geo-Hydrographic. Mission Guinea, Rio de Buba, April 1955»
«The tide goes up ... and the observation has to be made. Geo-Hydrographic. Mission Guinea, Rio de Buba, April 1955»