(1977). Proceedings of the American Congress on Surveying and Mapping, 37th Annual Meeting, Washington, D.C., February 27-March 5, 1977. Falls Church, VA: American Congress on Surveying and Mapping.
Παραπομπή Chicago StyleProceedings of the American Congress On Surveying and Mapping, 37th Annual Meeting, Washington, D.C., February 27-March 5, 1977. Falls Church, VA: American Congress on Surveying and Mapping, 1977.
Παραπομπή MLAProceedings of the American Congress On Surveying and Mapping, 37th Annual Meeting, Washington, D.C., February 27-March 5, 1977. Falls Church, VA: American Congress on Surveying and Mapping, 1977.
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