TY  - BOOK
AU  - Heddens,James W.
AU  - Speer,William R.
TI  - Today's mathematics Part 1: concepts and classroom methods 
SN  - 9780471387947 (Paperback)
AV  - QA135.5 HED 
PY  - 2001///
CY  - New York
PB  - John Wiley
KW  - Mathematics
KW  - Study and teaching (Elementary)
N1  - Includes bibliographical references and index
ER  -