Sources
https://www.invasive.org/weedcd/pdfs/wgw/whitepoplar.pdf
https://forest.jrc.ec.europa.eu/media/atlas/Populus_alba.pdf
https://www.srs.fs.usda.gov/pubs/misc/ag_654/volume_2/populus/populus.htm
https://kaitlinbevis.com/2013/11/25/mythology-monday-leuce/
https://www.theoi.com/Nymphe/NympheLeuke.html
https://www.theoi.com/Titan/TitanOkeanos.html
https://www.getty.edu/art/collection/object/108D0S
https://www.theoi.com/Khthonios/PotamosAkheron.html
https://www.jstor.org/stable/pdf/287716.pdf
http://www.visual-arts-cork.com/painting/panel-paintings.htm