M. F.  Goodchild, Davis, F. W., Painho, M., and Stoms, D. M., ?The Use of Vegetation Maps and Geographic Information Systems for Assessing Conifer Lands in California?, NCGIA, Santa Barbara, 1991.

M. F.  Goodchild, Davis, F. W., Painho, M., and Stoms, D. M., ?The Use of Vegetation Maps and Geographic Information Systems for Assessing Conifer Lands in California?. NCGIA, 1991.