Recently, I came across this webiste
It's made up of reports and pictures from people all over the
world, concerning the places they've travelled to.
In this site, I found a lady from the Netherlands who's been
running trucks of humanitarian goods to an orphanage and hospital in
the Uzhgorod, Ukraine area. Since my father's parents came from
villages close by, I sent her an e-mail, and she will be checking
with her friends there to see if a genealogy researcher in Uzhgorod
can be found.
This lady also has posted a number of photographs of that area.
So, depending on which Slovak community you're interested in, you may
find someone who has travelled or has contacts there.
Hope this helps.
San Jose, California