PhilStooke, And sheet 2. My Gaspra maps and many others are in NASA's Small Bodies Node of the PDS, here:
I only just noticed that some of their links are broken, always to the ones with labelled grids. I think this is because of an update which changes the way some coordinates are defined.
Spoiler alert - that page will lead to lots of maps of other bodies which I will be posting about later. So do not look past Gaspra! I know I can trust you because you are on the Internet.