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Keywords: Window retrofitt.jpg en As part of every window assessment survey the presence of rare costly or difficult to replicate materials such the wavy historic cylinder glass reproduced for these mid-19th-century windows must be identiied as features requiring a window retrofit approach rather than replacement 2012-04-12 http //www gsa gov/graphics/pbs/Windows pdf GSA National Parks Service PD-USGov Uploaded with UploadWizard GSA technical preservation guidelines |