NASA technical memorandum TM (series). X-58168. Proceedings of NASA earth resources survey symposium, Houston, Tex., June 1975: v. 1-A, Technical session presentations, agriculture, environment; v. 1-B, Technical session presentations, geology, information systems and services; v. 1-C, Technical session presentations, land use, marine resources; v. 1-D, Technical session presentations, water resources [with bibliographies].

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