Rlogo.jpg and logo.jpg from the R website

SP27GTIF.TIF (Chicago), cea.tif, and erdas_spnad83.tif from ftp://ftp.remotesensing.org/pub/geotiff/samples

MR5905167_372.nc from https://www.usgodae.org/ftp/outgoing/argo/dac/csiro/5905167/profiles/MR5905167_372.nc