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| 100 | _aCROWTHER J G | ||
| 245 | 0 | _aDISCOVERIES AND INVENTIONS OF THE 20TH CENTURY | |
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_aLOND. _bROUTLEDGE AND KEGAN _c1966 |
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| 690 | _aINVENTIONS,20TH;CENTURY | ||
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