"There's also "vide verso" (see the other side [of the page]). Guess it's just old conventions."

Yep. Librarianship uses that kind of terminology all the time. In a cataloging record, if there's something of note on the back of the title page, its location is referred to as "verso t.p.". If there is no place of publication or publisher listed, we put "s.l." (sine loco) and "s.n." (sine nomine), respectively, in those fields of the database record. Library work is a great opportunity to be high-tech and stodgy at the same time.