TY  - BOOK
AU  - Underhill,Robert G.
AU  - Uprichard,A.Edward
AU  - Heddens,James W.
TI  - Diagnosing mathematical difficulties
U1  - 372.7 
PY  - 1980///
CY  - Columbus, Ohio
PB  - Merrill
KW  - Mathematics
KW  - Remedial teaching
ER  -