TY  - BOOK
AU  - Munch,Theodore W.
TI  - What is light
T2  - The What is it series
AV  - PE1127.S3 M85
U1  - 535 
PY  - 1960///]
CY  - Chicago
PB  - Benefic Press
KW  - Readers
KW  - Science
ER  -