TY  - BOOK
AU  - Murphy,Stuart J.
AU  - Karas,G.Brian
TI  - Elevator magic
T2  - MathStart
SN  - 0060267747
U1  - 513.2 
PY  - 1997///
CY  - New York, NY
PB  - HarperCollins
KW  - Subtraction
N1  - "Level 2, subtracting."
Lexile: 500L
N2  - Explains the concept of subtraction through a rhyming text about a descending elevator
UR  - http://www.loc.gov/catdir/description/hc041/96005672.html
ER  -