Longwall retreat of gate road pillars /

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Bibliographic Details
Author / Creator:	Listak, Jeffrey M.
Imprint:	Washington, D.C. (810 7th St., N.W., Washington 20241-0001) : U.S. Dept. of the Interior, Bureau of Mines, 1993.
Description:	11 pages : illustrations ; 28 cm.
Language:	English
Series:	Report of investigations ; 9444 Report of investigations (United States. Bureau of Mines) ; 9444.
Subject:	Ground control (Mining) -- Pennsylvania. Pillaring (Mining) Longwall mining -- Pennsylvania.
Format:	E-Resource Microform U.S. Federal Government Document Book
URL for this record:	http://pi.lib.uchicago.edu/1001/cat/bib/7242263

Hidden Bibliographic Details
Other authors / contributors:	Bauer, Eric R. United States. Bureau of Mines.
Notes:	Distributed to depository libraries in microfiche. Includes bibliographical references (page 11). Available via Internet at the National Institute for Occupational Safety and Health web site. Address as of 7/11/08: http://www.cdc.gov/niosh/mining/pubs/pdfs/ri9444.pdf ; current access available via PURL.
Other form:	Original Original
GPO item no.:	0637-A (MF)
Govt.docs classification:	I 28.23:9444

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