an abacus, notebook, the abacus - Stock Illustration [3964453] - PIXTA
Notebook sketchbook for lovers math abacus , soroban , japanese abacus, mind abacus: 8.5*11 inch 21.5*27.94 cm 100 pages abacus notebook : Edition, abacus: Amazon.es: Libros
Old Abacus Notebook On Green Background Stock Photo 138300587 | Shutterstock