D. Walker

A Statistical Alternative to the Zoning of Pollen Diagrams

S. R. Wilson, D. Walker, 1978 .

Textbook of Modern Pollen Analysis.

K. Faegri, J. Iversen, D. Walker, 1951 .

THE PLANT GEOGRAPHY OF YUNNAN PROVINCE, SOUTHWEST CHINA

Xw Li, Xw Li, D Walker, 1986 .