The Preservation Planning Unit Resource Center (PPURC or “Perk”) is an online finding aid to research materials for those conducting Historical & Architecutal Surveys and for those nominating properties to the National Register of Historic Places and the Colorado State Register of Historic Properties.

• Architects of Colorado Biographical Series
• State Business Directory Guide to Colorado Architects, 1875 to 1950
• Builders of Colorado Biographical Series

• National Register Multiple Property Documentation Forms

• Cultural Resource Survey Forms
• Colorado Cultural Resources Survey Manual
• Colorado’s Historic Architecture & Engineering
• The Camera and Clipboard Newsletters
• Post-World War II Residential History and Survey Materials
• Community Assessment: Available Research Materials for Historical & Architectural Surveys

• Nomination Documents

• Electronic Library of Colorado Architecture, Landscape and Planning
• Western History Photograph Collection, Denver Public Library
• The Historic American Buildings Survey (HABS)
• The Historic American Engineering Record (HAER)

• Historical & Architectural Survey Program
• National Register & State Register Programs

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