(1972). Proceedings of the American Congress on Surveying and Mapping, Fall Convention, October 11-14, 1972, Columbus, Ohio. Washington, D.C: American Congress on Surveying and Mapping.
Παραπομπή Chicago StyleProceedings of the American Congress On Surveying and Mapping, Fall Convention, October 11-14, 1972, Columbus, Ohio. Washington, D.C: American Congress on Surveying and Mapping, 1972.
Παραπομπή MLAProceedings of the American Congress On Surveying and Mapping, Fall Convention, October 11-14, 1972, Columbus, Ohio. Washington, D.C: American Congress on Surveying and Mapping, 1972.
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