A foundational study in the pedagogy of arithmetic /
Howell, Henry Budd
A foundational study in the pedagogy of arithmetic / Henry Budd Howell. - New York : MacMillan, 1914. - 328 p. : il.
Aritmética--Estudio y enseñanza
A foundational study in the pedagogy of arithmetic / Henry Budd Howell. - New York : MacMillan, 1914. - 328 p. : il.
Aritmética--Estudio y enseñanza