1 x Haeder "The indicator handbook for examining and improving power plants, steam engines, steam boilers, internal combustion engines and pumps and compressors", with many figures, tables and examples, Wiesbaden: Haeder, 1909, all-linen and 1 x Haeder "The sick gas engine. Manual for installation, operation, maintenance, inspection and repair of internal combustion engines", with 430 illustrations, Duisburg: Commission publisher Schwann, 1907, full linen, different Signs of age and use
