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Windisch, S. J., & Soulié, M. (1970). Technique for Study of Granular Materials. Journal of the Soil Mechanics and Foundations Division, 96(4), 1113-1126. Lien externe
Smedes, H. W., Pierce, K. L., Tanguay, M. J., & Hoffer, R. M. (mars 1970). Digital computer terrain mapping from multispectral data and evaluation of proposed earth resources technology satellite (ERTS) data channels, Yellowstone National Park: Preliminary Report [Communication écrite]. Earth Sources Observations and Information Systems Metting, Annapolis, MD, USA. Lien externe
