The Historic Houses and Outbuildings Resources is the most comprehensive of the series of materials and begins with a series of articles arranged alphabetically. From there files include collected materials related to house and outbuilding type. Two subseries, Greek Revival and Interiors, contains additional subgroups of research materials. The subseries Houses is further divided into Michigan and Non-Michigan homes. The Michigan subseries has extensive files pertaining to Ann Arbor and then townships within Washtenaw County. These are arranged alphabetically and the township files are not equally representative.