Greetings, I have downloaded and imported this Tiff into several GIS programs. It appears to me that it was assumed that the grid lines on the quad sheets were UTM83, but it clearly states on the quad sheets that the grid datum is UTM27. So don't expect this Tiff to line up with other data unless you can transform it. Kurt Masters Berlin, NH Georeferenced Tiff idig2 2009-02-17 16:08:58 2009-02-17 16:08:58 3 1 3.00