In Russian. Kobzar, Leonid Leontyevich. Methodology for calculating the hydraulic resistance coefficient and speed profile in a pipe with regular roughness. Obninsk: 1973. Metodika rascheta koeffitsienta gidravlicheskogo soprotivleniya i profilya skorosti v trube s regulyarnoy sherokhovatostyu. In Russian/Methodology for calculating the hydraulic resistance coefficient and speed profile in a regular roughness pipe. All images are for identification of editions only. Several books of the same edition may be available. Please feel free to request photos of available books. SKU7399676