Features of diphtheria during the period of its elimination - PDF (Russian)
© 1980 Ivanov N.R., Maksimova N.A., Sklyarova E.M., Gordeichuk A.F., Gagina G.F.
![Creative Commons License](https://i.creativecommons.org/l/by-nc-sa/4.0/88x31.png)
This work is licensed
under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.