Takashi Kojima

Advanced abacus

2012

Japanese Abacus Use and Theory

Japanese Abacus Use and Theory

2012

Japanese Abacus (Large)

Japanese Abacus (Large)

1996

Japanese Abacus (Medium)

Japanese Abacus (Medium)

1996

Japanese Abacus (Small)

Japanese Abacus (Small)

1996

Moderingu tekunikku

1991

Written on Water

1972

The Japanese abacus

1967