TY  - BOOK
AU  - Childs,Williams Harolds Joseph
TI  - Physical constants : Selected for students
T2  - Monographs on physical subjects
AV  - QC61 C45 1951
PY  - 1951///
CY  - London
PB  - Methuen and co., 
KW  - Lemb
KW  - Física--Tablas
ER  -