G. Manning

Projecting Iowa's outdoor-recreation needs to 1980

H. H. Webster, G. Manning, F. S. Hopkins, 1973 .

forest resources and utilization in Canada to the year 2000

G. Manning, H. R. Grinnell, 1971 .

Development of biomass equations for British Columbia tree species.

J. P. Demaerschalk, G. Manning, J. Standish, 1985 .

Demand relationships for outdoor recreation in Iowa

G. Manning, 1968 .