APA

ACSM-ASPRS Annual Convention, American Society for Photogrammetry and Remote Sensing, American Congress on Surveying and Mapping, American Congress on Surveying and Mapping & ASPRS Annual Meeting. (1991). Baltimore 1991. Bethesda, MD: American Society for Photogrammetry and Remote Sensing and American Congress on Surveying and Mapping.

Chicago

ACSM-ASPRS Annual Convention, American Society for Photogrammetry and Remote Sensing, American Congress on Surveying and Mapping, American Congress on Surveying and Mapping and ASPRS Annual Meeting. 1991. Baltimore 1991. Bethesda, MD: American Society for Photogrammetry and Remote Sensing and American Congress on Surveying and Mapping.

Harvard

ACSM-ASPRS Annual Convention, American Society for Photogrammetry and Remote Sensing, American Congress on Surveying and Mapping, American Congress on Surveying and Mapping and ASPRS Annual Meeting. (1991). Baltimore 1991. Bethesda, MD: American Society for Photogrammetry and Remote Sensing and American Congress on Surveying and Mapping.

MLA

ACSM-ASPRS Annual Convention, American Society for Photogrammetry and Remote Sensing, American Congress on Surveying and Mapping, American Congress on Surveying and Mapping and ASPRS Annual Meeting. Baltimore 1991. Bethesda, MD: American Society for Photogrammetry and Remote Sensing and American Congress on Surveying and Mapping. 1991.