Seattle Public Library staff can help you with your projects! They have the Seattle Room that include their Special Collections and staff available to help you.
Seattle Room Hours
Monday - Thursday: 11 a.m. - 6 p.m.
Saturday - Sunday: 1 p.m. - 5 p.m.
Some of the Special Collections are available online:
How to get a SPL Library Card - http://www.spl.org/using-the-library/get-started/free-library-service-areas
Special Collections Research Guide
The Lemieux Library has some specials collections you can use (by appointment only). Some examples below from the University Archives and History Collection (find the full list here)