To cite webmap in publications, please use:

Fisher JC (2023). “webmap—Interactive web maps using The National Map (TNM) services.” U.S. Geological Survey, Reston, Va. doi:10.5066/P9CPB1WD, R package version 1.0.7, https://doi.org/10.5066/P9CPB1WD.

Corresponding BibTeX entry:

  @TechReport{webmap-package,
    title = {webmap---Interactive web maps using The National Map (TNM)
      services},
    author = {Jason C. Fisher},
    institution = {U.S. Geological Survey},
    type = {Software Release},
    year = {2023},
    note = {R package version 1.0.7},
    address = {Reston, Va.},
    doi = {10.5066/P9CPB1WD},
    url = {https://doi.org/10.5066/P9CPB1WD},
  }