The Bay Psalm Book
Only 11 copies of the 1640 edition of the Bay Psalm Book exist, two were owned by Old South Church in Boston, until it sold one of them in November, 2013, for $14.2 million. One of those two books can be viewed on the church’s website. This site uses Adobe Flash, which does not work on iPads and iPhones.
The copy of the Bay Psalm Book owned by the Library of Congress is on the LOC website.