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I'm using ArcGIS 10.2 Desktop on a Windows platform.

I have georeferenced about a dozen USGS topographic raster maps from around 1900. Each georeferenced map is an now an .mxd file. To the best of my limited knowledge there are no layers associated with any of these maps.

I would like to tile these into a single map [to which multiple layers would be added] but cannot find a way to do this. Perhaps I need to start over using a different technique?

Would be VERY grateful for any suggestions on how to solve this problem.

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Welcome to GIS SE! Please do not take offense that I just removed your signature but, as per the help, every Question, Answer & Comment you post is already signed by your user card. –  PolyGeo Apr 2 at 12:37
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Select and copy all layers in one .mxd, than paste them to the another .mxd Layer Of Contents. –  dmh126 Apr 2 at 12:42

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Because you don't have that many different mxds, you could open each one and save the georeferenced image as a .lyr file (right-click the layer in the table of contents, then Save As Layer File...). Put them all in the same folder, then open a blank mxd and it'll be easy to add all of the new .lyr files.

You could also look into creating a Raster Catalog.

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Thank you very much for your help. This worked very nicely, though the source data has some anomolies which lead to small mismatches at the intersections of some of the tiles. Really helped move the project along. –  user28750 Apr 7 at 21:15

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