teaching aids 63 geodesy 57 geometry 56 geography 53 civil engineering 41 mathematics 38 steel structures 28 more ... history 26 agriculture 26 mathematical analysis 24 building constructions 24 examples 22 physics 21 mathematical statistics 21 strength 20 applications programs 19 differential calculus 19 electrotechnics 19 programming 19 mechanical engineering 19 controlling 19 integral calculus 18 programming languages 18 elasticity 18 telecommunications 18 probability theory 18 concrete constructions 17 chemistry 17 transport 17 hydromechanics 17 less ...