TY  - BOOK
AU  - Ryder,R.W.
TI  - Earthing principles and practice
U1  - 621.319 
PY  - 1952///]
CY  - London
PB  - Pitman
KW  - Electric currents
KW  - Grounding
KW  - MCE
N1  - 0; 0; 0; 621_319000000000000_RYD
ER  -