@book{ BA06744605, author = "United Nations. Dept. of International Economic and Social Affairs and United Nations. Economic Commission for Africa and Expert Group Meeting on Acquisition of Marine Surveying Technologies", title = "Acquisition of marine surveying technologies, Addis Ababa : report of the Expert Group Meeting on Acquisition of Marine Surveying Technologies, Addis Ababa, 19-23 October 1987", publisher = "United Nations", year = "1988", URL = "https://ci.nii.ac.jp/ncid/BA06744605" }