Also available online in PDF format from the U.S. Geological Survey Warehouse (http://pubs.er.usgs.gov/).
Bibliography
Includes bibliographical references and index.
Form
Also available online from the U.S. Geological Survey Warehouse http://pubs.er.usgs.gov/publication/b873.
System Details
Master and use copy. Digital master created according to Technical Guidelines for Digitizing Archival Materials for Electronic Access. U.S. National Archives and Records Administration, 2004. http://www.archives.gov/preservation/technical/guidelines.html TxDN
Processing Action
digitized 2015 University of North Texas committed to preserve pda TXdn.010
Reproduction
Electronic reproduction. Denton, Texas : University of North Texas, 2015 . Electronic reproduction from print master produced by University of North Texas.
