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{{HPB-SB-item | {{HPB-SB-item | ||
| volume =11 | | volume =11 | ||
| page = | | page =291 | ||
| item = | | item =1 | ||
| type = article | | type = article | ||
| status = wanted | | status = wanted | ||
| continues = | | continues =292-294 | ||
| author =Purdon, John E. | | author =Purdon, John E. | ||
| title =An Experimental research | | title =An Experimental research | ||