TY  - BOOK
TI  - Polyconstructo: building spatial visualization skills from tow to three dimensions
U1  - KIT 510 P768 
KW  - Space perception--Study and teaching (Elementary)
KW  - Geometrical constructions
KW  - Geometry--Study and teaching (Elementary)
N1  - 1. 8 blue
2. 29 red
ER  -