1891. Sanborn Map Company. Duquesne, Allegheny Co., Pa., Aug. 1891. 1 map on 3 sheets : col. ; sheets 65 x 54 cm. Scale approximately 1:600. 50 ft. to an in. Sanborn Map Company.
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1891. Sanborn Map Company. Homestead, Allegheny Co., PA, July 1891. 1 map on 6 sheets : col. ; sheets 65 x 54 cm. Scale approximately 1:600. 50 ft. to an in. Sanborn Map Company.
1891. Sanborn Map Company. Sharpsburg, Allegheny Co., Pa., April 1891. 1 map on 5 sheets : col. ; sheets 65 x 54 cm. Scale approximately 1:600. 50 ft. to an in. Sanborn Map Company.
1891. Sanborn Map Company. Tarentum, Allegheny Co, Pa, Oct. 1891. 1 map on 6 sheets : col. ; sheets 65 x 54 cm. Scale approximately 1:600. 50 ft. to an in. Sanborn Map Company.