The upper Devonian and lower Mississippian of southwestern Pennsylvania / by Wilson M. Laird.
Material type:
TextPublication details: [Harrisburg : 1941]Description: 1 p. l., 23 p. : tables, diagrs. ; 23 cmSubject(s): LOC classification: - QE157 .A293 no. 126
At head of title: ... Commonwealth of Pennsylvania. Dept. of internal affairs ... Topographic and geologic survey ...
"Literature survey": p. 2-4.
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