Mathematics 22 Surveying 11 Arithmetic 10 Mathematics Education--19th Century 10 Almanacs, English 8 Study and teaching 8 History 7 more ... Geometry 6 Business mathematics 5 College teachers 5 Faculty 5 Mathematical models 5 Mathematics education--18th century 5 Science 5 Scientific apparatus and instruments 4 Trigonometry 4 Biography 3 Histoire 3 Mathematical instruments 3 Plane trigonometry 3 Authorship 2 Education--Mathematics--18th century 2 Education--student notes--19th century 2 Environmental protection 2 Families 2 Handbooks, vade-mecums, etc 2 Logarithms 2 Mathematical recreations 2 Mathematics--Problems, exercises, etc 2 Mathématiques 2 Navigation 2 Navigation--Study and teaching--18th century 2 Printing 2 Self-instruction 2 Textbooks 2 World War, 1914-1918 2 Writing 2 Accounts--18th century 1 Accounts--19th century 1 Affirmative action programs 1 less ...