http://www.nga.gov/feature/moran/prang.html
thanks to:
http://www.lib.udel.edu/ud/spec/exhibits/color/lithogr.htm
http://sheldon.unl.edu/HTML/ARTIST/Prang_L/FFF.html
http://www.wit.edu/Reslife/LPVAN.html
http://www.scrapalbum.com/xmasp11.htm
http://www.nga.gov/feature/moran/prang.html
http://www.antiquetalk.com/prang.htm