Our collection of topographical maps is entirely historical, with the most recent maps published around 2007ish. We, too, interfile regardless of the agency that created them. All our topos are shelved by scale, then state, then quad. title, then date. They're either uncataloged, or cataloged only at the collection level. -- Emily-Jane *Emily-Jane Dawson* *Reference Librarian* Multnomah County Library Central Library Sunday-Thursday 503.988.5728 multcolib.org