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Keywords: landscape outdoor pittsburgh monochrome blackandwhite architecture black and white 1915. "Dr. Walter F. Rittman. Gasoline plant at Pittsburg." Bureau of Mines chemical engineer Walter Rittman developed the "Rittman process" used in petroleum refining. 1915. "Dr. Walter F. Rittman. Gasoline plant at Pittsburg." Bureau of Mines chemical engineer Walter Rittman developed the "Rittman process" used in petroleum refining. |