Mode of access: Internet from the Forest Service Forest Health Protection web site. Address as of 7/9/08: http://www.fs.fed.us/r1-r4/spf/fhp/publications/bystate/R1Pub93%5F05%5FPrelim%5Fvalidation%5FDFBeetle%5Fhazard%5Frating.pdf; current access available via PURL.