A fracture mechanics study of crack propagation mechanism in coal
Subtitle: the mechanics of fine fragment formation : fifth annual report (October 1, 1987-September 30, 1988)
By: Z.T. Bitniawski, R. Karl Zipf, Jr
Contributors: Zipf, R. Karl; Pennsylvania State University. College of Earth and Mineral Sciences; Generic Mineral Technology Center for Respirable Dust
Series: [Open file report -- 8-90]; Open file report (United States. Bureau of Mines) -- 90-8
Publisher: College of Earth and Mineral Sciences, PennState
Published: 1988
Place of publication: [University Park, Pa.]
Language: eng
Format: Microform
Number of pages: 302
Subjects: Coal-cutting bits; Coal-mining machinery
Other titles: Mechanics of fine fragment formation; College of Earth and Mineral Sciences
Notes: "Fifth and final annual report covering the period October 1, 1987 through September 30, 1988; report constitutes Dr. Zipf's doctoral thesis"--P. ii

Distributed to depository libraries in microfiche

Shipping list no.: 94-0012-M

"October 1, 1988."

Generic Mineral Technology Center for Respirable Dust G1135142 4201 (PSU 1)

Header reads from cover: College of Earth and Mineral Sciences

Includes bibliographical references (leaves 235-247)

Microfiche. [Washington, D.C. : Supt. of Docs., U.S. G.P.O., 1994] 4 microfiches : negative