I'm looking for a sheet from the AMS Greenland 1:250k series (C501). The sheet is NT 17, 18, 19, 20-10 (aka Hvalsund). I've seen evidence that this sheet actually exists--it's even held by a few libraries (e.g., Harvard, Penn St.)--but have not yet found it online. 

No success at two of my usual sources for something like this:

* UMN's Polar Geospatial Center has the series but not the sheet

* UTexas--sorta inexplicably and against all odds--seems not to have the series at all. (Am I blind?)

Can anybody help?

Thanks very much.

Michael