System requirements (for text): Adobe Acrobat Reader.
Mode of access: Internet from the USGS web site. Address as of 8/7/03: http://pubs.usgs.gov/bul/b2172-f/; current access available via PURL.
Note
Title from title screen (viewed Aug. 7, 2003).
File Type
Text is in PDF format. Digital tabular data are available as separate files. Computers and software may use the data without transcription from the Portable Document Format (.pdf) of the text. The data are provided in a raw form as tab-delimited text files (.tab files), usable by most spreadsheet and database programs.