This was the last US open that Sammy Reshevsky played in (I think) and I'm interested in seeing a cross table...
Regarding chess history; 1990 US open championship

It is quite possible the USCF put out a yearbook the following year which would have details. You might have better luck with the Florida Chess Association - the event in Jacksonville was a huge deal for them, and they probably had extensive coverage in their state newsletter. They might be willing to send you copies, or at least photocopies of their archived issues.
Unfortunately, that was just before everything started being preserved digitally and posted online.
Thanks for the tip. I've been down this road a couple of times before and I'm simply amazed that there is no chess historian/author out there who has been inspired to take the time and compile the score tables of our history....
I have become interested in finding a score table for the US open chess championship in 1990 as well as a few other random events. Does anyone know of any resource out there to help a history geek like me find score table and detailed tournament results from chess major events?