To cite webmap in publications, please use:

Fisher, J.C., 2023, webmap---Interactive web maps using The National Map (TNM) services: U.S. Geological Survey software release, R package, Reston, Va., https://doi.org/10.5066/P9CPB1WD.

Corresponding BibTeX entry:

  @TechReport{,
    title = {webmap---Interactive web maps using The National Map (TNM)
      services},
    address = {Reston, Va.},
    author = {Jason C. Fisher},
    institution = {U.S. Geological Survey},
    type = {Software Release},
    year = {2023},
    note = {R package},
    version = {1.0.0},
    doi = {10.5066/P9CPB1WD},
  }