Merge .pdf files using CutePDF-Pro
If you teach college and create notes or other writings for your courses you can step up to authoring e-books or printed workbooks by outputting your writings as separate .pdf files (Word 2007 and beyond do this, Macs have always been able to do it) then concatenating those files into one .pdf. This doesn't take expensive Adobe software to do; the tool I show here named CutePDF-Pro costs less than $50 and does this very easily, and can also apply pages numbers to the finished file. I have used this technique for several years for workbooks published by Stipes Publishing of Champaign, IL. See http://piopi.co/205 for a course workbook created in this way.