1. The Original Area
East-West — 54,800 ft. — 10.38 miles
North-South — 42,720 ft. — 8.09 miles
Total 83.97 sq. mi.
Approved by National Geographic, December 10, 1971
2. Add one mile Northward
East-West — 54,800 ft. — 10.38 miles
North-South — 5,280 ft. — 1.00 miles
Total 10.38 sq. mi.
Approved by National Geographic, June 8, 1972
3a. Final northern addition
East-West — 54,800 ft. — 10.38 miles
North-South — 20,490 ft. — 3.88 miles
Total 40.27 sq. mi.
3b. Eastern edge addition
East-West — 12,200 ft. — 2.31 miles
North-South — 68,500 ft. — 12.972 miles
Total 29.97 sq. mi.
Approved simultaneously by National Geographic, December 10, 1972
Total size of map, as contoured by Lockwood Mapping (17 sheets @ 1:4800)
12.972 miles (68,500 ft.) North-South
12.689 miles (67,000 ft.) East-West 164.602 square miles
Size of map distributed in National Geographic Magazine, July 1978 (printed May 1978)
12.642 miles (66,750 ft.) North-South
8.097 miles (42,750 ft.) East-West 102.36 square miles
Size of map for public sale (printed June 1978)
12.50 miles (66,000 ft.) East-West
12.78 miles (67,500 ft.) North-South 159.80 square miles