My father-in-law's aunt worked for the NEA in Washington DC and she had tons of books in her home. She passed away a few years ago, and he found this book in her collection. It stood out from everything else because of its binding and apparent age. Any idea what it is?
That's amazing. I'll transliterate and translate the cover page for you:
Ein sehr schönes Tractatlein von der wahren Christlichen Andacht: Darinn sehr schön und herzlich aufgeführt wird: I Was die Andacht sey: II Von derer Nothwendigheit; Auch III Wie man dieselbe erhalten und behalten koenne. Strasburg/In Verlegung Caspar Dietzels. Im Jahr M. DC. XXXIV
Translation:
A very beautiful pamphlet about the Christian attention: In it very beautifully and softly listed: I What the attention would be: II About its necessity: Also III How one can obtain and keep it. Strasburg/in the publishing of Caspar Dietzels. In the year 1634
This page claims it is a text written by Lewis Bayly, whose wikipedia page would make me suppose this is a translation out of English, of a well-read text called Practice of Piety, published first around 1611.
So this is an early 17th century edition of a religious book written just a few decades earlier which was very popular in the 17th century. So on the one hand there's probably quite a few copies like this, but on the other hand quite a few people might be interested in it.