GASP ! 35 years !. Pittsburgh 1906. During World War II. Quenching coke. View from Liberty Bridge, 1954. View from Liberty Bridge, 1965. View from Liberty Bridge, 1970’s. Allegheny County Health Dept, Air quality monitoring, 1970’s. Darkness at noon. 1945, Darkness at 11:00am.
Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.