"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 t...