Keywords: Crataegus douglasii range map 3.png en Natural distribution map for Crataegus douglasii with the extreme northwestern eastern and southern populations circled in red 1976 http //esp cr usgs gov/data/little/ USGS Geosciences and Environmental Change Science Center Digital Representations of Tree Species Range Maps from Geographic Distribution of the Pines of the World by William B Critchfield and Elbert L Little Jr ; Miscellaneous Publication 991 U S Department of Agriculture Forest Service Washington D C February 1966 William B Critchfield Elbert L Little Jr U S Department of Agriculture Forest Service PD-USGov Uploaded with UploadWizard Crataegus douglasii range maps |