Materialy dlia sanitarnoi statistiki Sviiazhskago uiezda : opyt sravnitel'noi demografii Russkoi i Tatarskoi narodnostei : dissertatsiia na stepen' doktora meditsiny / Sergieia Ershova ; tsenzorami dissertatsii, po porucheniiu Konferentsii byli professory A.P. Dobroslavin, I.M. Sorokin i privat dotsent I.A. Verevkin.

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Materialy dlia sanitarnoi statistiki Sviiazhskago uiezda : opyt sravnitel'noi demografii Russkoi i Tatarskoi narodnostei : dissertatsiia na stepen' doktora meditsiny / Sergieia Ershova ; tsenzorami dissertatsii, po porucheniiu Konferentsii byli professory A.P. Dobroslavin, I.M. Sorokin i privat dotsent I.A. Verevkin. Public Domain Mark. Source: Wellcome Collection.

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