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usgs.gov
pubs.er.usgs.gov
Snyder, John P. (1987). Map Projections: a Working Manual. U.S. Geological Survey Professional Paper 1395. Washington, D.C.: United States Government Printing Office. Archived from the original on May 16, 2008. Retrieved 26 April 2011.
Snyder, John P. (1987). Map Projections: a Working Manual. U.S. Geological Survey Professional Paper 1395. Washington, D.C.: United States Government Printing Office. Archived from the original on May 16, 2008. Retrieved 26 April 2011.