How to become a lightning calculator

Language

Duration

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Series

Multum in Parvo Library, Vol. I, No. 2, February, 1894.

Credits

Demian Katz, Craig Kirkwood, and the Online Distributed Proofreading Team at https://www.pgdp.net (Images courtesy of the Digital Library@Villanova University (http://digital.library.villanova.edu/))

Publisher

Project Gutenberg

Rights

Public domain in the USA.

Subjects

Mental arithmetic