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“A biosystematic study of the relationship of Nama hispidum and Nama stevensii (Hydrophyllaceae).”
29: 367-375.
1984.
1985.
“Reconnaissance Report: St. Croix River Study”
: 185 p. in various pagings: maps; 28 cm..
1984.
1933.
1993.
1994.
1869.
1974.
1976a.
1976b.
1978.
1981.
1983.
1984.
1982.
1983.
“The evolution of bird-dispersed pines”
4: 185-219.
1990.
1991.
1991.
1991.