Snyder, John P., "Map Projections--A Working Manual", U.S. Geological Survey
Professional Paper 1395 (Supersedes USGS Bulletin 1532),
United States Government Printing Office, Washington D.C., 1987.
Accessed: 2016-05-09. https://pubs.er.usgs.gov/publication/pp1395
Snyder, John P. and Voxland, Philip M., "An Album of Map Projections",
U.S. Geological Survey Professional Paper 1453 ,
United State Government Printing Office, Washington D.C., 1989.
Accessed: 2016-05-09. https://pubs.er.usgs.gov/publication/pp1453
"Cartographic Projection Procedures for the UNIX Environment-
A User's Manual" by Gerald I. Evenden,
USGS Open File Report 90-284 and Release 4 Interim Reports (2003).
Accessed: 2016-06-09. http://www2.bren.ucsb.edu/~frew/ESM264/private/proj_manual.pdf
Snyder, John P., "Flattening the Earth -
Two Thousand Years of Map Projections", Univ. Chicago Press, 1993
"New Equal-Area Map Projections for Noncircular Regions", John P. Snyder,
The American Cartographer, Vol 15, No. 4, October 1988, pp. 341-355.
Snyder, John P., "Map Projections--A Working Manual", U.S. Geological
Survey Professional Paper 1395 (Supersedes USGS Bulletin 1532), United
State Government Printing Office, Washington D.C., 1987.
Access date 2016-05-09. https://pubs.er.usgs.gov/publication/pp1395
"Software Documentation for GCTP General Cartographic Transformation
Package", U.S. Geological Survey National Mapping Division, May 1982.
