4511 - 4665: [Mathematics]. Kenji Aochi.

76/4605 [Mathematics]. Kenji Aochi. Futsu niichi tensaku: nosho nichiyo. Ehon, Tokyo, Shorindo, Meiji 15 (1882), 85 lvs., num. anonymous woodcut ills., orig. cordbound wr. w. hashira-title.

- Title for the larger part worn off. = Showing ills. of i.a. an abacus.

Yoshikazu Matsuoka. Zoho sangaku keiko daizen. Ehon, Osaka, Kawachiya Tasuke han, Bunkyu 1 (1861), 141 lvs., num. anonymous woodcut ills., orig. cordbound wr. w. hashira-title.

- Sl. waterstained.

€ (70-90) 80