TY  - BOOK
AU  - 3G E-learning
TI  - Core concepts in physics: sound and light 
SN  - 9781984637611
U1  - REF.535 C81 
PY  - 2020///
CY  - New York, New York
PB  - 3G E-Learning
KW  - Sound-waves
KW  - light (energy)
ER  -