Wisconsin. Chief Geologist / Geology of Wisconsin. Survey of 1873-1879 ...
Volume II (1877)
T. C. C.
Prefatory note, pp. -4 PDF (530.2 KB)
Based on date of publication, this material is presumed to be in the public domain.| For information on re-use see: http://digital.library.wisc.edu/1711.dl/Copyright