In copyright
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Les grands problèmes médicaux : Lettre de M. le profeseur Béchamp à M. le docteur Michant, sur les deux périodes de la vie scientifiques de Louis Pasteur; suivie d'éclaircissements devenus indispensables touchant l'histoire des organismes dits "infiniment petits" / by A. Béchamp. In copyright. Source: Wellcome Collection.