I love John Highfill's book myself, also Wyane Miller's book (just for the amazing collection photos of some really high end coins and monster toners).
I made a list of all the Morgan dollar
books I have in my collection, it's a long, list, with a lot of very specialized books beyond the average or new collector, but a good list to start with just so you know whats out there; http://goccf.com/t/152565
I wrote that list up about 6 years ago so there are some books not in it that have come out since. John Highfill has a new edition of his encyclopedia now, which I haven't got (yet).
"Buy the Book Before You Buy the Coin" - Aaron R. Feldman - "And read it" - Me 2013! ANA
Life Member #3288 in good standing since 1982, EAC Member #6202, NBS Member, 2¢ variety collector.
See my want page: http://goccf.com/t/140440