Dr. Flavio Ferri-Benedetti has recently completed a freely available PDF of a translation of an Anonymous "Regole di canto figurato, contrappunto, d'accompagnare", circa 1670-90, edited by Dr. Elam Rotem.
(Credit to Dr. Derek Remeš‎ for the link)
Free PDF of Dr. Flavio Ferri-Benedetti's translation of a 17th century music counterpoint manuscript