Keywords: Salix nigra range map 3.png en Natural distribution map for Salix nigra black willow 1971 1976 http //esp cr usgs gov/data/little/ USGS Geosciences and Environmental Change Science Center Digital Representations of Tree Species Range Maps from Elbert L Little Jr 1971 Atlas of United States trees Vol 1 conifers and important hardwoods U S Department of Agriculture Miscellaneous Publication 1146 9 p 200 maps; and 1976 Atlas of United States trees Vol 3 minor Western hardwoods U S Department of Agriculture Miscellaneous Publication 1314 13 p 290 maps Elbert L Little Jr of the U S Department of Agriculture Forest Service PD-USGov Uploaded with UploadWizard Salix nigra range maps |