TY  - BOOK
AU  - Walter,Marion I.
TI  - Boxes, squares, and other things: a teacher's guide for a unit in informal geometry 
U1  - 516.23 WAL 
PY  - 1971///
CY  - Washington
PB  - National Council of Teachers of Mathematics.
KW  - Geometry
KW  - Study and teaching
N1  - Include bibliography
ER  -