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Bureau of Land Management shape file depicting areas of Colorado, USA which have no sub-surface mineral rights.
This data set is a result of combining data sets that were collected at each BLM Colorado Field Office and using other source material of various ventages from the BLM Colorado State Office. In most cases the data was referenced from BLM's 100K Sub-Surface Published Maps (the most recent publications). In other cases data the source data was compiled to 7.5 minute USGS Quads and mosaic together to create a seamless field office layer. BLM State Office GIS Staff obtained these datasets and created a statewide mosaic. In cases where data was out dated or missing in the final mosaic, BLM Colorado GIS Staff filled in the gaps and updated the data layer by heads up digitizing using the most recent scanned and geo-refernced digital 100K Surface/Sub-Surface in a GIS system.
Any hardcopies utilizing these data sets shall clearly indicate their source. If the licensee has modified the data in any way they are obligated to describe the types of modifications they have performed on the hardcopy map. Licensee specifically agrees not to misrepresent these data sets, nor to imply that changes they made were approved by the Bureau of Land Management.
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