Sparro R. P., Dubah A. D. Drainage of bogs by open ditches: Theoretical and practical guide: With attached estimates, various tables, laws, treaties, conditional signs, etc. In Russian (ask us if in doubt)/Sparro R. P., Dubakh A. D. Osushenie bolot otkrytymi kanavami: Teoret. i prakt. rukovodstvo: S pril. smet, razlich. tabl., uzakoneniy, dogovorov, uslov. znakov i pr. R. Sparro, Engineering-Hydraulic Technician at Moscow-Tver Agriculture and State Property, A. D. Dubakh, Engineering-Hydraulic Technician at Moscow-Chernobyl Land and State Property. G. U.Z. and Z. Department of Land Improvement Moscow: Moscow City Printing House, 1912 (2, VI, 353 p.). SKUalbf7164ac704ad67e1.