Newark, Delaware: Spiral Press for Friends of the Curtis Paper Co. 1965. First edition - A brief history of the Mason-Dixon line and how it became so embedded in our national awareness as the dividing line between the free North and the slave holding South. The 12th publication in a series of Americana commissioned each year by the Curtis Paper Company of Newark, Delaware. Designed by Joseph Blumenthal and printed by the Spiral Press on Curtis paper. 26 pp plus colophon and large fold-out colored map by David Soshensky.