(1970). Proceedings of the American Congress on Surveying and Mapping: 33rd ammual meeting, Washington, D.C., March 11-16 1973. Washington: The American Congress on Surveying and Mapping.
Παραπομπή Chicago StyleProceedings of the American Congress On Surveying and Mapping: 33rd Ammual Meeting, Washington, D.C., March 11-16 1973. Washington: The American Congress on Surveying and Mapping, 1970.
Παραπομπή MLAProceedings of the American Congress On Surveying and Mapping: 33rd Ammual Meeting, Washington, D.C., March 11-16 1973. Washington: The American Congress on Surveying and Mapping, 1970.
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