On the arithmometer of M. Thomas (de Colmar), and its application to the construction of life contingency tables. Gray, P. C. & E. Layton, London, 1884.
On the arithmometer of M. Thomas (de Colmar), and its application to the construction of life contingency tables. [link]Paper  bibtex   
@book{gray_arithmometer_1884,
	address = {London},
	title = {On the arithmometer of {M}. {Thomas} (de {Colmar}), and its application to the construction of life contingency tables.},
	url = {https://catalog.hathitrust.org/Record/001740935},
	urldate = {2017-12-23},
	publisher = {C. \& E. Layton},
	author = {Gray, Peter},
	year = {1884},
}

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