1894. Sanborn Map Company. Apollo, Armstrong County, Pa, June 1894. 1 map on 5 sheets : col. ; on sheets 64 x 54 cm. Statement of responsibility: Sanborn-Perris Map Co., Limi... Sanborn Map Company.
1925. Sanborn Map Company. Apollo, Armstrong County, Pennsylvania : including Luxemburg Heights [and] West Apollo. 1 map on 9 sheets : color ; on sheets 65 x 55 cm. Scale ap... Sanborn Map Company.
1871. Whittlesey, Asaph, 1826-1879. Shows railroads and acreage of the Apostle Islands.; "Bayfield, Wis., situated upon the largest and best protected Harbor on this Continent, and sh... Northwestern Litho. Co. (Reed & Monasch) (St. Paul, Minn).