Mackall's Mill Race Baltimore and Ohio Railroad Company. Philadelphia Division. Culverts -- Maryland -- Cecil County. Depicts a single, stone culvert near Mackall's Grist and Saw Mill. March 1891. Cyanotypes 1890-1900 digitool:36596 Library Company of Philadelphia Print Dept. albums - B&O [P.9945.49] P.9945.49 Part of B & O Railroad Album Part of B & O Railroad Album: "Bridges and buildings, Philadelphia Division, Baltimore & Ohio Railroad, 1891." Cecil County (Md.)