Patterns of error in the addition number facts /
Thyne, James M
Patterns of error in the addition number facts / By James M Thyne - London : University of London Press, c1954 - xx, 275 p. ; 23 cm. - Publications of the Scottish Council for Research in Education, 37 .
Arithmetic--Study and teaching.
372.72 / THP 1954
Patterns of error in the addition number facts / By James M Thyne - London : University of London Press, c1954 - xx, 275 p. ; 23 cm. - Publications of the Scottish Council for Research in Education, 37 .
Arithmetic--Study and teaching.
372.72 / THP 1954