97 Mathematics education
97Uxx Educational material and media. Educational technology
97U99 None of the above, but in this section (1 articles)
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Staňková, Jitka:
Početní pravítka.
(Czech) [Calculating rulers].
Pokroky matematiky, fyziky a astronomie,
vol. 5
(1960),
issue 6,
pp. 669-675