Robert A. Sadler

• Henry Deringer pistols from 1826-1870
• Applying Pre-Algebra
• Math in Astronomy
• Solving Math Problems In Astronomy
• Us presidents puzzles
• Book of historical handguns
• Creating and Using Web Pages
• Pre-Calculus
• Pre-Calculus Workbook
• Pre-Calculus, Grades 5 - 8+