Manual de uso del ábaco vigesimal Nepohualtzintzin
Nepohualtzintzin
Amazon.com: NEPOHUALTZINTZIN - and the secret of * Abaco Maya *: Japanese Soroban - Introduction to Addition and Subtraction eBook : Wartensteiner, Gerald: Kindle Store
Ábaco Maya usos y beneficios educativos – Hacer y Aprender
Ábaco de bolas Maya NEPOHUALTZINTZIN - Museo de la Ciencia de la UPNA
Amazon.com: NEPOHUALTZINTZIN - and the secret of * Abaco Maya *: Japanese Soroban - Introduction to Addition and Subtraction eBook : Wartensteiner, Gerald: Kindle Store