Which preposition to use with plebiscitum

of Occurrences 1%

In May, 1910, within such period of limitation, by act of legislature, supplemented by a plebiscitum of the people and the executive action of Governor Haskell, the capital was removed to Oklahoma City, and the State seal conveyed there surreptitiously, in spite of the injunction of a Federal district court.

Which preposition to use with  plebiscitum