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You searched for: Creator Personal Names Leonard, Joseph W. Remove constraint Creator Personal Names: Leonard, Joseph W. All Creators Leonard, Joseph W. Remove constraint All Creators: Leonard, Joseph W. All Subjects Coal mines and mining--Research. Remove constraint All Subjects: Coal mines and mining--Research.
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1. Research needs in coal mining.

Creator Personal:
Leonard, Joseph W.
Title:
Research needs in coal mining.
Call Number:
P3940
Date:
undated
Description:
Serial issue. Issued as: West Virginia University. Coal Research Bureau. Technical report, no. 100.
Subject Topical:
Coal mines and mining--Research.
All:
Coal mines and mining--Research.