Here is a link to a PGN article that references the study.
http://www.fortgrundsow.com/PGN1984AprHowItWas5.jpg


The exclosures are an acceptable option if DCNR is willing to spend the money necessary to construct the exclosures. They are a much better option than reducing the statewide herd to a density that DCNR can satisfy SCS without fencing. But, DCNR will not be willing to fence wilderness areas so the tree huggers can see more trilliums ,so they are using DMAP tags instead.