[Washington, D.C.] : United States National Science Foundation, [2005]
Physical Details
12 pages : digital, PDF file
data file
OCLC
ocm70154230
Title from title screen (viewed on June 21, 2006).
Date supplied from NSF document number.
"NSF-05-069."
Mode of access: Internet from the NSF web site. Address as of 6/21/2006: http://www.nsf.gov/pubs/2005/nsf05069/nsf05069.pdf; current access available via PURL.