Included here are documents which provide information on several different buildings, though the buildings were not constructed as an architectural unit. These buildings may be gathered together for the purpose of reflecting on the work of a particular architect, builder, kit house company, building materials suppliers, professional organizations, or survey of a particular building type such as churches, etc. The common denominator is that the documents contain several structures within a single source which were not architecturally planned as an architectural complex. For those multiple building sources which are planned together, see Series IV.

Sources are organized under the name of the architect or primary company or building logo. These individual or corporate names are arranged alphabetically. If an architect has acted both alone or in corporation, his materials may be found together if the materials suggest, or separate, with cross references from his/her different associations.