TY  - BOOK
TI  - Understanding: viruses
PY  - 2004///
CY  - Silver Spring, Md
PB  - Discovery Communications, Inc
KW  - Viruses
N1  - Program time: 52 minutes
N2  - DVD Features: video index, curriculum units, standards link, teaching resources
UR  - http://discoveryschool.com
ER  -