@book{99987,
	author = {Bölsche, Wilhelm,},
	title = {Eiszeit und Klimawechsel},
	publisher = {Project Gutenberg,},
	year = {2019},
	address = {Salt Lake City, UT :},
	note = {Release date is 2019-03-31},
	url = {https://www.gutenberg.org/ebooks/59161}
}