George F. Cram (1842-1928), served in the U.S. Army during the American Civil War. After the war ended, Cram joined his uncle's map business in 1867. Two years later, he formed the George F. Cram Co. which became a leading map firm and first American firm to publish a world atlas. It employed a relief process.
Andrew M. Modelski, "History of Railroads and Maps" (Washington: Library of Congress, 1984), pp. ix-xxi, which represented a revision of the "Introduction" to Railroad Maps of the United States, compiled by Andrew M. Modelski (Washington: Library of Congress, 1975), pp. 1-14. Available at http://memory.loc.gov/ammem/gmdhtml/rrhtml/rrintro.html
"Soldiering with Sherman: Civil War Letters of George F. Cram." (2000). Jennifer Cain Bohrnstedt (Editor), George Franklin Cram, Orville Vernon Burton (Introduction), Northern Illinois University Press.