000
00268nam a2200109Ia 4500
008
220201s1952 xx 000 0 eng d
100
_a
Ryder, RW
245
0
_a
Earthing principles & practice
260
_b
London: Sir Isaac Pitman
_c
1952
300
_a
108
942
_2
ddc
999
_c
70864
_d
70864