@book{43944,
	author = {Groner, Auguste, and Colbron, Grace Isabel,},
	title = {The Case of the Registered Letter},
	publisher = {Project Gutenberg,},
	year = {1999},
	address = {Salt Lake City, UT :},
	note = {In Joe Muller: Detective, Being the Account of Some Adventures in the Professional Experience of a Member of the Imperial Austrian Police},
	url = {https://www.gutenberg.org/ebooks/1833}
}