00494nam a2200229Ia 4500 210210b1926 xxu||||| |||| 00| 0 eng d eng 535/29 DUNOYER (L) Vacuum practice Tr by J H Smith London G Bell & Sons Ltd. 1926 x,228 Vacuum Tr Smith practice J H by Electricity 008647 126517 126517 0 0 0 2 Physics AL AL Electricity 2021-02-17 0.00 0 535/29 008647 2021-02-17 00:00:00 2021-02-17 BK