Always good to hear from you, Anita. My guess is that the definition may be spelled out in a piece of historic preservation regulation somewhere (maybe the Secretary's Standards...), but my bet is that the working definition would include historians, archeologists, curators, architectural historians, and historic architects. TV -- Tom Vaughan "The Waggin' Tongue" <[log in to unmask]> (970) 533-1215 11795 Road 39.2, Mancos, CO 81328 USA Cultural Resource Management, Interpretation, Planning, & Training