There is not much, if any, anti-NFP material out there. No one seems to raise much voice against NFP - it is too convenient a thing for Catholic users. But it is another Modernist error. As for Jeanne Dvorak, well, if a good priest or Bishop would write a proper piece of Catholic literature to put forth the Church's true position on birth control and its NFP variant, someone like "whoever the hell she is" would not have to step into the breach, now would she...?
There is some kind of vested interest that goes with the big push for NFP in the modern Church, and in some trad groups as well. What could it be? Regarding the NFP subject, and how it actually is not Catholic, it is curious how many "protesteth too much...".