Discovered that, yes, it is possible to ride a bike from the house to the library. Without riding on truly major streets, and only one huge street cross. With time to wander at the library and rest for the ride back, it's about an hour and a half total trip. About 25 minutes each way, riding time.
The way there has one short steep hill and the rest of it looks flat but is very subtly uphill.
Which makes the way back an easy ride. Even with a backpack full of books.