Library Special Collections include items that are rare or unique, relevant to specific research areas, and made available with an interest in preserving and protecting the materials. Here at the University of Arkansas Libraries that includes:
Special Collections hours are generally Monday - Friday 8am to 5pm and some Saturday hours.
Maximize your time in the archvies: take a look at the "Getting Started" guide on their web page about doing research.
After reading up on the policies and procedures, prepare in advance of your visit by completing the researcher registration form.
You can always contact the archivists via email at specoll@uark.edu.
Here is a general approach for finding and using the various materials available in Special Collections.