The “Read” tab is for keeping tracks of all books. Here you have a row for each book with its location and the mini challenges. The mini-challenge cell can be filled with a comma separated list of all challenges it counts for, using the short names: C01,C02,…,C15.
If you are going to import your books’ locations directly from this spreadsheet then you can only add one location per book or you have to add a book multiple times, once for every location! And if you want to make use of my script (see below) you do not enter anything in the “in map” column, that will happen automatically. If you don’t, you use that column to keep track of whether you’ve marked a location on your map yet.