@book{61287,
	author = {Piron, A.},
	title = {Du service des postes et de la taxation des lettres au moyen d'un timbre},
	publisher = {Project Gutenberg,},
	year = {2006},
	address = {Salt Lake City, UT :},
	note = {Release date is 2006-11-30},
	url = {https://www.gutenberg.org/ebooks/19984}
}