My system : 15 minutes' work a day for health's sake / by J.P. Muller ; specially revised by the author and translated by G.M. Fox-Davies and H.R. Murray.

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My system : 15 minutes' work a day for health's sake / by J.P. Muller ; specially revised by the author and translated by G.M. Fox-Davies and H.R. Murray. In copyright. Source: Wellcome Collection.