@book{comptometer_division_instruction_1944,
	title = {Instruction {Manual} for the {Operation} of the {Comptometer}},
	url = {http://archive.org/details/instrschool},
	abstract = {This instruction book was used at Felt \& Tarrant Comptometer schools. It consists of
32 leaves of thick paper printed on only one side, and bound at the top edge by two metal
rings. It covers the basics of arithmetic in 14 lessons, and it would take about 13 days
to teach. According to the its table of contents, there were about three more similar course
books to follow for the full 3-month course.},
	language = {eng},
	urldate = {2017-12-20},
	author = {Comptometer Division, Felt \& Tarrant Mfg Co},
	year = {1944},
	keywords = {Comptometer},
}

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