Sanborn maps were designed to assist fire insurance agents in determining the degree of hazards associated with a particular building, showing size, shape, construction materials, fire walls, windows, doors, sprinkler systems and roofing materials.
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Columbus Grove
Map Dates: 1895, 1901, 1911, 1924, 1934, 1951
Continental
Map Dates: 1901, 1908, 1915, 1928
Leipsic
Map Dates: 1889, 1893, 1900, 1910, 1916, 1928, 1939
Ottawa
Map Dates: 1884, 1893, 1900, 1911, 1924, 1931