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| 100 | 1 | _aPayne, A M | |
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_aOral immunization against poliomyelitis. _h[electronic resource] |
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_bBulletin of the World Health Organization _c1960 |
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_a695-703 p. _bdigital |
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| 500 | _aPublication Type: Journal Article | ||
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_tBulletin of the World Health Organization _gvol. 23 _gno. 6 _gp. 695-703 |
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