@book{70284,
	author = {Wackernagel, Wilhelm,},
	title = {Meinauer Naturlehre},
	publisher = {Project Gutenberg,},
	year = {2009},
	address = {Salt Lake City, UT :},
	note = {Release date is 2009-07-18},
	url = {https://www.gutenberg.org/ebooks/29436}
}