----------------------------Original message---------------------------- Snyder's manual is a (the) standard reference in analytical cartography, but if you need code for projections: ftp://charon.er.usgs.gov/pub/PROJ.4/PROJ.4.3.2.tar.Z is source code for a projection tool. [log in to unmask] Environmental Scientist/GIS Specialist My thoughts may not reflect Agency or Federal Government policy, plans, etc..... U. S. Environmental Protection Agency, Region 2, ESD, MMB