Instructions for determining the declension of the magnetic arrow during the production of instrumental topographic survey

Savitsky, M.A.Instructions for determining the declension of the magnetic arrow during the production of instrumental topographic survey: with 9 political stories in the text / comp.d.M.A.Savitsky;Ed.Ed.d.A.A.Tillo.- St. Petersburg: Type.Imp.Acad.Sciences, 1894. -[4], 20 p.: silt .. -Ex.: With a handle.litter..I. Tillo, A.A.1.Territory (collection).Electronic copy source: PBOriginal storage location: Ban RAS