@book{102156,
	author = {Waldron, William H.},
	title = {Elements of Trench Warfare},
	publisher = {Project Gutenberg,},
	year = {2020},
	address = {Salt Lake City, UT :},
	note = {Release date is 2020-02-06},
	url = {https://www.gutenberg.org/ebooks/61330}
}