Authors: Hagle, S.K.; Gibson, K.E.; and Tunnock, S
License: Public Domain / CC0
Citation (MLA Form): Hagle, S.K.., Gibson, K.E., and Tunnock, S. "Field guide to diseases and insect pests of northern and central Rocky Mountain conifers. Report No. R1-03-08." 2003 (Reprinted in 2013 with minor revisions). U.S. Department of Agriculture, Forest Service, State and Private Forestry, Northern and Intermountain Regions..