WARREN CHEMICAL AND MANUF'G Co. FIRE AND WATER-PROOF FELT, CEMENT AND GRAVEL ROOFING MATERIAL SAMPLES. Circa late 19th century? A collection of items relating to roofing materials consisting of: 1.) Envelope addressed to LINGENFELTER & BALDWIN/STONE MILL/N.Y.; 2.) Printed cover letter describing the "samples of which are herewith enclosed"; 3.) Four samples. Please see enlargements for details. The samples each measure 3 1/8" x 5 1/2". The envelope measures 3 1/2" x 6". The envelope is missing its stamp and has some wear and a tear at the left edge otherwise in very good condition.