TY  - BOOK
AU  - Zlot, William Leonard.
TI  - Elementary school mathematics: teaching the basic skills 
SN  - 069000849X
AV  - QA135.5 .Z55 1976
U1  - 510 
PY  - 1976///
CY  - New York
PB  - Crowell
KW  - Arithmetic
KW  - Study and teaching
N1  - Includes bibliographical references and index
ER  -