(1971). Papers from the 31st Annual Meeting [of] American Congress on Surveying and Mapping, March 7-12, 1971. Washington, D.C: American Congress on Surveying and Mapping.
Παραπομπή Chicago StylePapers From the 31st Annual Meeting [of] American Congress On Surveying and Mapping, March 7-12, 1971. Washington, D.C: American Congress on Surveying and Mapping, 1971.
Παραπομπή MLAPapers From the 31st Annual Meeting [of] American Congress On Surveying and Mapping, March 7-12, 1971. Washington, D.C: American Congress on Surveying and Mapping, 1971.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.