Aerial photography and seaplane reconnaissance to produce the first total distribution inventory of submersed aquatic vegetation in Chesapeake Bay, Maryland
Macomber, R.T ; Fenwick, G.H
Proceedings of the ... annual meeting of the American Society of Photogrammetry (USA), 1979, Vol.2
Agricultural communication; the role of the media in extension and training - Report of a mass communication feasibility study with a ten year development programme (1980-1990) for Bauchi State Agricultural Development Project, Northern Nigeria
Giltrow, D ; British Council, London eng 22778 ; Potts, J
London (UK) British Council, Printing and Pub. Dept 1978