The great ice age in Pennsylvania /
Lewis, Henry Carvill, 1853-1888.
The great ice age in Pennsylvania / by H. Carvill Lewis. - [Philadelphia? : Franklin Institute?, 1883] - 21 p., [1] folded leaf of plates : map ; 24 cm.
Cover title. "Abstract of a lecture, delivered at the Franklin Institute, January 5, 1883." "Reprinted from the Journal of the Franklin Institute, April, 1883."
ca 06002473
Geology--Pennsylvania.
Glacial epoch--Pennsylvania.
QE697 / .L61
The great ice age in Pennsylvania / by H. Carvill Lewis. - [Philadelphia? : Franklin Institute?, 1883] - 21 p., [1] folded leaf of plates : map ; 24 cm.
Cover title. "Abstract of a lecture, delivered at the Franklin Institute, January 5, 1883." "Reprinted from the Journal of the Franklin Institute, April, 1883."
ca 06002473
Geology--Pennsylvania.
Glacial epoch--Pennsylvania.
QE697 / .L61