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References
1."The Growth of Foam Plastics Worldwide for the Next Five Years" ,
R. E. Polson
, The Dow Chemical Company .
2.Deutsche Norm, DIN 4108, "Wärmeschutz in Hochbau" .
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5.Photograph courtesy of Badische Anilin und Soda Fabrik , AG, Ludwigshafen am Rhein , Germany .
6.
Private communication, Mr. M. D. Chamberlain, Tar and Chemical Division, Koppers Company, Inc.
7.Photograph courtesy of A. W. Andernach , KG , Bonn/Beuel , Germany .
8.U.S. Patent 3 ,094 ,447 , "Method of Making an Insulated Roof" , M. D. Chamberlain, assigned to Koppers Company, Inc.
