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Contributor search for hall, conrad w.,
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Communication from the Governor, relative to the Geological Survey of the State.

by New York State Geological Survey.

Format: Print Book 1837
Availability:
Table of Contents: ... Report of T.A. Conrad on the Palaeontological Department of the Survey -- ...
Other: ... by W.W. Mather -- ...
Cover Image

Air brake patents. Vol. 13.

Format: Print Book 1924
Availability:
Other: ... . 564,304, dated July 21, 1896 / Fredrick C. Conrad and Charles W. Goodspeed -- Air-brake ...
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Air-brake patents. Vol. 7.

Format: Print Book 1924
Availability:
Other: ... : specification forming part of letters patent no. 433,982, dated August 12, 1890 / Charles W. Hall -- Car-brake ...