Condition of surface natural waters in the district of Serpuhov - PDF (Russian)
Copyright (c) 2008 Voronin A.V., Golubev D.V., Rykov S.V., Skakovsky E.D.
![Creative Commons License](http://licensebuttons.net/l/by-nc/4.0/88x31.png)
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.