The examples below use a tile layer that shows a map of stream courses in the Mississippi delta area, produced by Harold N. Fisk for the Presidential Mississippi River Commission, 1944. The maps included in the report are in the public domain. The map used here is sheet 4 of plate 15 of the report. The TileJSON representation of the map, as a JavaScript object, is:
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Strictly speaking this is not a custom map, as it does not sem to be possible to disable the default map layer.
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