Jasz Language

Hello all, I'm new to the list and wonder if anybody knows of an
online copy of that document discovered in 1957 and dated to 1422
which contains a list of words from the original Iranian language
of the Jász people of Hungary. I'm interested in Ossetic and it's
history and would like to be able to compare it's evolution in the
Caucasus to that of the dialects further to the west. Thank you.
-David Russell Watson