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Bridges, E.L. and S.L. Orzell.  1989.  Longleaf pine communities of the West Gulf Coastal Plain. Natural Areas J. 9:246-363.

Diggs, G.M., B.L. Lipscomb, M.D. Reed, and R.J. O’Kennon.  2006.  Illustrated flora of east Texas. Sida Bot. Misc. 26:1-1594.

Fenneman, N.M.  1938.  Physiography of the eastern United States. McGraw-Hill, New York. 714 pp.

Frost, C.C.  1998.  Presettlement fire frequency regimes of the United States: a first approximation. Tall Timbers Fire Ecology Conference Proceedings 20:70-81.

Harcombe, P.A., J.S. Glitzensten, R.G. Knox, S.L. Orzell and E.L. Bridges.  1993.  Vegetation of the longleaf pine region of the West Gulf Coastal Plain. Proc. Tall Timbers Fire Ecology Conf. 18:83-103.

Hardy L.M. (ed.).  0000.  Freeman and Custis red River Expedition of 1806: two hundred years later. Bull. Museum of Life Sciences 14.

MacRoberts, M.H. and B.R. MacRoberts.  2001.  Bog communities of the West Gulf Coastal Plain: a profile. Bog Research Pap. Bot. & Ecol. 1:1-151.

MacRoberts, M.H., B.R. MacRoberts, B.A. Sorrie, and R.E. Evans.  2002b.  Endemism in the West Gulf Coastal Plain: importance of xeric habitats. Sida 20:767-280.

MacRoberts, M.H. and B.R. MacRoberts.  2003a.  West Gulf Coastal Plain ecoregions. Sida 20:1245-1274.

MacRoberts, M.H. and B.R. MacRoberts.  2003b.  The east-west transition of the flora in Texas: a biogeographical analysis. Sida 20:1693-1700.

MacRoberts, M.H. and B.R. MacRoberts.  2004a.  West Gulf Coastal Plain prairies: a first approximation at a synthesis. Pp. 5-21. In: The Third Eastern Native Grass Symposium, The North Carolina Botanical Garden, Chapel Hill.

MacRoberts, M.H. and B.R. MacRoberts.  2004b.  The post oak savanna ecoregion: a floristic assessment of its uniqueness. Sida 21:399-407.

Marks, P.L. and P.A. Harcombe.  1981.  Forest vegetation of the Big Thicket, southeast Texas. Ecology 56:1004-1008.

McLaughlin, S.P.  2007.  Tundra to Tropics: the floristic plant geography of North America. Sida Bot. misc. 30:1-58.

Poole, J.M., W.R. Carr, D.M. Price, and J.R. Singhurst.  2007.  Rare plants of Texas.   Texas A & M Press.

Sorrie, B.A. and A.S. Weakley.  2001.  Coastal plain vascular plant endemics: phytogeographic patterns. Castanea 66:50-82.

Taktajan, A.  1986.  Floristic regions of the World. Univ. California Press, Berkeley. 462 pp.

Thorne, R.F.  1993.  Phytogeography. Pp. 132-153. In: Flora of North America Committee, eds., Flora of North America. Vol. 1. Oxford University Press, New York.

Turner, B.L., H. Nichols, G. Denny, and O. Doron.  2003.  Atlas of the Vascular Plants of Texas. Sida, Bot. Misc. 24:1-888.

Van Kley, J.E.  2006.  The pineywoods. Pp. 76-106. In: G.M. Diggs, B.L. Lipscomb, M.D. Reed, and R.J. O’Kennon, eds., Illustrated flora of east Texas. Sida Bot. Misc. 26:1-1594.

Van Kley, J.E., R.L. Turner, L.S. Smith, and R.E. Evans.  2007.  Ecological classification system for the National Forests and adjacent areas of the West gulf Coastal Plain: 2^nd. approximation. The Nature Conservancy and Stephen F. Austin State Univ., Nacogdoches, Texas. 379 pp.

Weakley, A.S., K.D. Patterson, S. Landall, and M. Pyne.  2000.  International classification of ecological communities; terrestrial vegetation of the southeastern United States. The Nature Conservancy, Chapel Hill, North Carolina. 532 pp.