WGSRPD Standard, Brummitt, R.K., Pando, F., Hollis, S., Brummitt, N.A. (2001). World geographical scheme for recording plant distributions. Edit. 2. TDWG Standard no2. Pittsburg (PA, USA): Hunt Institute for Botanical Documentation, Carnegie Mellon University. Full standard, 2nd Edition
WGSRPD Presentation, Pando, F. (2020) The TDWG World Geographical Scheme for Recording Plant Distributions Standard. Rationale and history (presentation). CC-BY.
Map data:
Natural Earth Data, Tom Patterson, Nathaniel Vaughn Kelso et al, Hypsometric Tints and Terrain Elevations, 2009 - 2025, Public Domain, NACIS (North American Cartographic Information Society).