The Appalachian region. Paleozoic Appalachia, or, The history of Maryland during Paleozoic time;
by Bailey Willis ...
- Baltimore, John Hopkins press, 1900.
- 4 p.l., [23]-93 p. illus., XII pl. (incl. fold. maps) 26 cm.
At head of title: Maryland Geological survey. "Special publication, volume IV, part I."