N.A.Semashko and the Kazan State Pedagogical University named after V.I.Lenin - PDF (Russian)
© 1974 Rahmatullin I.M., Nizamov I.G.
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under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
This work is licensed
under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.