Abacus arithmetic ; how to perform some calculations on the Chinese abacus.
| Author/creator | Crook, Welton J., 1886- |
| Format | Book |
| Publication Info | Palo Alto, Calif. : Pacific Books, [1958] |
| Description | 69 pages : illustrations ; 21 cm |
| Subjects |
| LCCN | 58007709 |