The first one

Ted Widmer has a Slate article about the first US book:

In a hidden corner of the John Carter Brown Library at Brown University, inside a box with a false title (to ward off thieves), lies a book of legendary rarity.  A recent appraiser from Sotheby’s pegged its value at ten million dollars.
After penetrating its defenses, the book itself is surprisingly ordinary to look at.  A worn out calf binding, soft to the touch, greets the interloper, and then, inside the cover, a set of casual doodles and signatures, in an old seventeenth-century hand. How can this very used book be so valuable?
Perhaps because it is the first book published in what would become the United States. The so-called Bay Psalm Book was a project of extraordinary ambition, undertaken by the Puritans of Massachusetts not long after they crossed the Atlantic and began to live around Boston.  At Cambridge, a printing press brought over from England began to issue The Word: first a freeman’s oath, then an almanac, and then the great project of a book of psalms. This would be useful in church— the Puritans, surprisingly, loved to sing— and it would show a doubting Europe that they were people of culture, ready to take on the world.  
The book is crude in ways— lines do not always align perfectly— but, when you consider what they were up against, thousands of miles from London, it’s a remarkable achievement. There are decorative elements here and there, and bits of Hebrew type dropped into the text. But if it speaks a bit proudly, it also warns against the sin of pride. The reason that this copy is so valuable is that it is the simplest. Only eleven copies are known to exist, and this one is considered the most perfect, still in its original binding.
See a full scan of this copy of the Bay Psalm Book at the World Digital Library.

Rico says it's an amazing thing...