U.S. DEPARTMENT OF THE INTERIOR
GALE A. NORTON, Secretary
U.S. GEOLOGICAL SURVEY
CHARLES G. GROAT, Director
UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON : 2003
Published in the Eastern Region, Reston, Va.
Manuscript approved for publication April 5, 2002.
Any use of trade, product, or firm names in this publication is for descriptive
only and does not imply endorsement by the U.S. Government.
Free on application to
U.S. Geological Survey
Box 25286, Federal Center
Denver, CO 80225
or call the toll-free telephone number
Library of Congress Cataloging in Publication Data
Schweinfurth, Stanley P.
Coal—a complex natural resource : an overview of factors affecting coal quality and use in the United
States / by Stanley P. Schweinfurth ; with a contribution on coal quality and public health by Robert
p. cm.- (U.S Geological Survey circular ; 1143)
Included bibliographical references.
1. Coal—United States. l. Title. ll. Series.
|TP326.U5 S38 2001||00–067694|