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. 1961 Sep 16;2(5254):[723]-726-1, 727-728. doi: 10.1136/bmj.2.5254.723

Protection of the Respiratory Tract^*

PMCID: PMC1969710 PMID: 13728183

723

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Text Fig. 1
on p.724

Text Fig. 3
on p.725

Fig. 1
on p.726-1

Fig. 2
on p.726-1

Fig. 3
on p.726-1

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