The textbook is Campbell and Shin 2011 (https://open.umn.edu/opentextbooks/textbooks/essentials-of-geographic-information-systems) and is shared under Creative Commons Attribution-NonCommercial-ShareAlike (CC BY-NC-SA), and as such, so is the text presented in this podcast. The only changes from the textbook are the introduction and conclusion, and time added for listeners to do one of the activities in the text.