TY  - GEN
AU  - Hack,John
TI  - Rock control and tectonism - their importance in shaping the appalachian highlands
T2  - U. S. Geological survey professional paper, 1126-B
KW  - Tectonique
KW  - Géologie historique
KW  - Erosion
KW  - Etats Unis
KW  - Appalaches
N1  - bibliogr. p. B16-B17
ER  -