Book Advanced Abacus Theory
Second book of Japanese Abacus Theory & Practice / Author Takashi Kojima / Published 1963 / Sixth printing 1971 / Printed in Japan / English / ~160 pages
Personal collection of vintage and modern Abacuses / Abaci.
Second book of Japanese Abacus Theory & Practice / Author Takashi Kojima / Published 1963 / Sixth printing 1971 / Printed in Japan / English / ~160 pages