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4. Brodhead, J. M. B., and P.J. Godfrey. 1978. The effects of off-road vehicles on coastal dune vegetation in the Province Lands, Cape Cod National Seashore. Report 32, University of Massachusetts, National Park Service Cooperative Research Unit, Amherst, 212 pp.
5. Carter, J. 1977. Executive order 11989: off-road vehicles on public lands.Federal Register 42(101), 2 pp.