Short description: In Russian. Lobachev, Vladimir Grigorievich. Nomograms for Calculating Circular Crossing Canals. Moscow: The People’s Commissary of Internal Affairs of the RSFSR, 1930. The image is provided for reference only. It may reflect condition of one of the available copies or only help in identifying the edition. Please feel free to contact us for a detailed description of the copies available. SKU9213470