Polkovskiy I.O. (inzhener putey soobshcheniya). Materialy dlya opisaniya russkikh rek i istorii uluchsheniya ikh sudokhodnykh usloviy. Vypusk IV. Tipy ukrepleniy beregov kanalov, rek i ozer. Tom 1. Tekst./Polkovsky I.O. (railway engineer). Materials for describing Russian rivers and the history of improving their navigational conditions. Issue IV. Types of fortifications of canals, rivers and lakes. Volume 1. Text. In Russian - landofmagazines.com

TransliterationPolkovskiy I.O. (inzhener putey soobshcheniya). Materialy dlya opisaniya russkikh rek i istorii uluchsheniya ikh sudokhodnykh usloviy. Vypusk IV. Tipy ukrepleniy beregov kanalov, rek i ozer. Tom 1. Tekst.

In EnglishPolkovsky I.O. (railway engineer). Materials for describing Russian rivers and the history of improving their navigational conditions. Issue IV. Types of fortifications of canals, rivers and lakes. Volume 1. Text. In Russian

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