The authors wish to thank their collaborator, Sharon C. Park, FAIA, Senior Historical Architect, Heritage Preservation Services, NPS, who undertook the technical editing of the publication and took the authors’ original manuscript and developed it into the Preservation Brief complete with compiling information from other sources and selecting the photographs. Kay D. Weeks and Michael J. Auer, Heritage Preservation Services, NPS, contributed substantially to the published manuscript by revising the draft with an eye to articulation of policy, organizational structure, and cohesiveness of language.

The authors also wish to thank the following for providing information for the publication and/or reviewing the final draft: Steade R. Craigo, AIA, Senior Restoration Architect, State of California; Randolph Langenbach, Architect, FEMA; Bruce Judd, FAIA, Architectural Resources Group; Melvyn Green & Associates; Cassandra Mettling-Davis and Carey & Co. Inc. Architecture; Curt Ginther, Architect, the University of California, Los Angeles (UCLA) Capital Program; The Crosby Group; American Institute of Architects, San Francisco Chapter; Jeffrey L. Eichenfield, California Preservation Foundation; Michael Jackson, Illinois Historic Preservation Agency; George Siekkinen, the National Trust for Historic Preservation; and colleagues at Heritage Preservation Services, NPS, including: deTeel Patterson Tiller, Chief; Charles E. Fisher, Anne E. Grimmer, John Sandor, and Jason Fenwick.

This publication has been prepared pursuant to the National Historic Preservation Act of 1966, as amended, which directs the Secretary of the Interior to develop and make available information concerning historic properties. Technical Preservation Services (TPS), Heritage Preservation Services Division, National Park Service prepares standards, guidelines, and other educational materials on responsible historic preservation treatments for a broad public.