A version of the book is ready to go for this coming semester and can be seen at UMass Phys 131 Textbook. Feedback on the book can be given at https://goo.gl/forms/AuAmDVXFuOruHJnc2. We are really excited to use this book for the first time this coming semester! We think that continuous nature of the students’ readings will make it easier for students to navigate and know what they need to read.