If we don't have a book on your subject, check the resources below. Washington County and Multnomah County Public Libraries have much bigger collections than we do, and chances are they will have something on your subject. Still not finding what you need? Check WorldCat for library holdings around the world, and send the citation to Erika, who can order just about anything from Interlibrary Loan.
Need help? Email Erika at email@example.com.