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 /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. St. Petersburg Public benefit 1903 on site. We have thousands of titles and often several copies of each title may be available. Please feel free to contact us for a detailed description of the copies available. SKUalb186ce4dfb488ad83.