TY  - BOOK
AU  - McGavack, John
AU  - LaSalle,Joseph P
TI  - Crystals, insects, and unknown objects: a creative approach to the teaching of science to intermediate school children 
AV  - Q 181 M25
PY  - 1971///
CY  - New York
PB  - J. Day
KW  - Ciencia -
KW  - Estudio y enseñanza
N1  - Incluye bibliografía
ER  -