Which preposition to use with verso

of Occurrences 2%

The verso of the title-page bears the date March 3, 1664/5.

per Occurrences 1%

A sanguinis putredine in vasis seminariis et utero, et quandoque a spermate diu retento, vel sanguine menstruo in melancholiam verso per putrefactionem, vel adustionem. 2430.

Which preposition to use with  verso