TY  - BOOK
ED  - BSCS
TI  - Level A investigating patterns of change: middle school science and technology 
SN  - 0840366760
AV  - QH359 .E928 1994
PY  - 1994///
CY  - Dubuque, Iowa
PB  - Kendall/Hunt Publishing Company
KW  - Biological interaction
N1  - includes index
ER  -