Good books for daddy

I'm 6 weeks pregnant with my second (my fiances first) and he is so over the top excited and wants to know everything he can in the next 8-9 months. I told him I would read books about babies growth, development and then labor and birth and annotate them so he could see my notes as well and I was wondering if any of you ladies had any books that your SO's read while you were pregnant that they found helpful or any you wish they had read. Thank you in advance! (If it makes a difference I'm hoping to do a home birth and most likely in a birthing pool)