Spoken by the largest ethnic minority in Vojvodina.
Used by the Slovak minority, primarily in central Vojvodina.
If you are looking for a copy, you can find the Ruthenian edition of the Basic Dictionary of Legal English on Amazon or through academic libraries specializing in Slavic and Balkan studies.
The dictionary focuses on the standard languages of the region: The international bridge language. Serbian: The primary official language of Serbia.
Specifically the Pannonian Rusyn variety, which is unique to this region and codified as a distinct language.