TY  - BOOK
AU  - Levin,Edith M.
TI  - The penetrating beam: reflections on light 
T2  - Student scientist series
SN  - 0823904164 :
AV  - QC355.2 .L48
U1  - 535 
PY  - 1978///
CY  - New York
PB  - Richards Rosen Press
KW  - Light
KW  - Licht
KW  - gtt
N1  - Bibliography: p. 113-115
UR  - http://www.archive.org/details/penetratingbeamr00levi
UR  - http://www.openlibrary.org/books/OL4720391M
ER  -