http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Visitor survey results for the Souris River Loop National Wildlife Refuges
1 volume (various pagings) : digital, PDF file.
by Natalie R. Sexton, Lynn Koontz, and Susan C. Stewart.
Title from PDF title screen (viewed on Mar. 23, 2006).
Mode of access: Internet from the USGS web site. Address as of 12/17/07: http://www.fort.usgs.gov/products/publications/21560/21560.pdf ; current access via PURL.
Des Lacs National Wildlife Refuge (N.D.)
J. Clark Salyer National Wildlife Refuge (N.D.)
Upper Souris National Wildlife Refuge (N.D.)
U.S. Geological Survey open-file report ; 2005-1399