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Need some help! I have some Russian Topo of Mongolia that I am georeferencing. The printing on the map is telling me that I have UTM Zone 48 WGS 66. The only two selections for that datum are WGS 84 & WGS 72. It will let me build a new datum, but I don't know the difference or the shift or scale factor between WGS 84 and WGS 66. Is WGS 72 the same as WGS 66? Can You Help? Also I did create a new WGS 66 Datum and did not put in any parameters, it saved it and now I can only over write it and not delete it!