The efficacy of B. C. G. vaccination : a study on vaccinated and tuberculin negative non-vaccinated conscripts / by Gunnar Dahlström and Hans Difs ; with a foreword by Arvid Wallgren.

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Difs, Hans, 1904-

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The efficacy of B. C. G. vaccination : a study on vaccinated and tuberculin negative non-vaccinated conscripts / by Gunnar Dahlström and Hans Difs ; with a foreword by Arvid Wallgren.