This instructional guide provides practical tips on the evaluation, repair, and maintenance of historic wooden windows typically found in rehabilitation projects. Published by the National Park Service as number nine in a series of technical preservation briefs, this booklet can be used by the do-it-yourselfer or developers. Other titles in the series explain the repair and rehabilitation of historic pigmented structural glass and steel windows; clay and wooden shingle roofs; architectural plaster and cast iron; and wood frame, adobe, and mortar buildings.