Chia sẻ tri thức – Kết nối cộng đồng học tập
Chia sẻ tri thức – Kết nối cộng đồng học tập
Aph.org
For over 160 years, APH has operated as the world’s largest nonprofit organization creating accessible learning for people who are blind and low vision.
Abacus Basic Competency: A Counting Method, Large Print
This instruction manual teaches children and adults abacus skills in the four basic math operations. This abacus instructional system uses the Counting Method.
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