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1867, 1868, 1869, 1870, 1871, 1872, 1873, 1874, 1875, 1876, 1877, 1878, 1879, 1880, and 1881. Gräf, A. (Adolf), active 1855-1878 and Stanford Geospatial Center. This layer is a georeferenced raster image of an historic continental map of Africa created by Adolf Gräf, and published by the Georgraphisches Ins... Stanford Digital Repository.