00761cam a22002291 4500 e 40000651 DLC 20260227111229.0 800401m19391941enk 000 0 eng c e 40000651 (OCoLC)6157165 U.S. Office of Education. Library. TxBeaL TxBeaL DLC premarc QA135 .S38 372.7 Scottish Council for Research in Education. Committee on Primary School Subjects. Studies in arithmetic. London, University of London Press [1939-1941] 2 v. 23 cm. Publications of the Scottish Council for Research in Education, 13, 18 Arithmetic Study and teaching (Primary) 21742 21742