Trigonometry Algebra 200 Textbooks 42 Functions 28 Graphic methods 24 Geometry, Analytic 22 Problems, exercises, etc 13 Statics 12 Strength of materials 12 Mathematics 9 Geometry 7 Calculus 5 Graphic calculators 5 Study and teaching (Secondary) 5 Arithmetic 4 Data processing 4 Functional anaylisis 4 Precalculus 4 Vector algebra 4 Functional analysis 3 Outlines, syllabi, etc 3 Early works to 1800 2 Geometry, Plane 2 Programmed instruction 2 Spherical 2 Surveying 2 . problems, exercises 1 Civil engineering 1 Curricula 1 Curriculum evaluation 1