Mapping mountain pine beetle and white pine blister rust in white bark pine on the Helena National Forest [electronic resource] / Nancy Sturdevant, Sandra Kegley.
Imprint
Missoula, MT : U.S. Dept. of Agriculture, Forest Service, Northern Region, Forest Health Protection, [2006]
Mode of access: Internet from the FHP web site. Address as of 7/23/08: http://www.fs.fed.us/r1-r4/spf/fhp/publications/bystate/R1Pub06-05%5FMapping%5FMPB%5FWPBrust%5FWBP.pdf; current access available via PURL.