Visitors to the library have a couple of options:
1) Purchase a Visitor permit and park in a Gold, Red, Blue, Purple, Silver, or Green parking lot. Permits are $2/day and can be purchased online, or at the Parking Office located in the Intermodal Transit Center on the corner of Sweet Avenue and Railroad Street (1006 Railroad Street).
2) Park at a self-serve pay station parking lot. You can pay with debit/credit cards and coins, and there are no limitations for the length of time purchased. Hourly rates vary based on the location and time of day, ranging from $0.75 to $1.25 per hour.
The campus parking map can help.