TY  - ELEC
A1  - Becker, R.A.
A1  - Wilks, A.R.
A1  - Brownrigg, R.
T1  - Mapdata: Extra map databases. R package version 2.3.1
Y1  - 2022
UR  - https://cran.r-project.org/web/packages/mapdata/index.htm

ER  -