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| Keywords: Before&After-GSA building's ductwork.jpg en Before GSA Building corridor ductwork installation in progress 1935 After After Relocating corridor ductwork to adjoining office spaces enabled GSA to restore previously concealed cove cornices and door transoms that now flood the corridor with welcomed daylight 2012-04-17 http //www gsa gov/graphics/pbs/HVAC pdf GSA PD-USGov Uploaded with UploadWizard GSA technical preservation guidelines | ||||
