To join, go to https://groups.google.com/forum/#!forum/nabtcc and click on Apply for membership. Note two important things: 1. Provide your name, position and institution in the text box so we know who you are. 2. You'll be asked to create a Google Account if you don't have one. You can specify that you want to use your own email address if you don't have a gmail.com email address. Otherwise Google will create a gmail.com address for you.