Geographic Distribution of the Pines of the World. Critchfield, W. B. & Little, E. L. U.S. Dept. of Agriculture, Forest Service, https://doi.org/10.5962/bhl.title.66393, 1966.
bibtex   
@book{critchfieldGeographicDistributionPines1966,
  title = {Geographic Distribution of the Pines of the World},
  author = {Critchfield, William B. and Little, Elbert L.},
  editor = {Library, Biodiversity H.},
  year = {1966},
  publisher = {{U.S. Dept. of Agriculture, Forest Service}},
  address = {{https://doi.org/10.5962/bhl.title.66393}},
  keywords = {*imported-from-citeulike-INRMM,~INRMM-MiD:c-13435881,featured-publication,free-access-book,global-scale,phytogeography,pinus-spp,species-distribution},
  lccn = {INRMM-MiD:c-13435881},
  number = {991}
}

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