Great Courses: The Joy of Thinking Part 1 & 2 DVD Box Sets on Science and Math

Excellent condition- the DVDs and books look unused. One disc is missing from the "Joy of Thinking" course. 1) MISSING DISC 1 The Joy of Thinking: The Beauty and Power of Classical Mathematical Ideas Part 1 taught by Edward B. Burger, and Michael Starbird 2) The Joy of Thinking: The Beauty and Power of Classical Mathematical Ideas Part 2