Thanks to Tim Woods for providing the url to the web-based standards. 
Here's one reference I found in a brief search there:

From: http://www.cr.nps.gov/hps/tps/standguide/rehab/rehab_standards.htm

"6. Deteriorated historic features will be repaired rather than
replaced. Where the severity of deterioration requires replacement of a
distinctive feature, the new feature will match the old in design,
color, texture, and, where possible, materials. Replacement of missing
features will be substantiated by documentary and physical evidence. "

Ben
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