1. Colvocoresses , A. P. McEwen , R. B. 1973 Progress in Cartography, EROS Program NASA symposium on significant results obtained from ERTS 1. US Geological Survey, Washington D.C 12
2. Two Engineer Board developments in photomapping equipment;Pennington;Photogrammetric Engineering,1946
3. Towards earth resources satellites: the American ERTS and Skylab programs;Steiner;Photogrammetria,1971
4. A new map of Alexander Island, Antarctica;Swithinbank;Polar Record,1974