D. R. Helliwell

Valuation of wildlife resources

D. R. Helliwell · Regional Studies · 1969 · 173 citations

Wildlife Resource, Engineering, Natural Resource Valuation +10

A Bioassay for Comparing Phosphorus Availability in Soils

A. F. Harrison, D. R. Helliwell · Journal of Applied Ecology · 1979 · 106 citations

Biogeochemistry, Engineering, Botany +13

The Effects of Size and Isolation on the Conservation Value of Wooded Sites in Britain

D. R. Helliwell · Journal of Biogeography · 1976 · 86 citations

Engineering, Forestry, Habitat Management +18

THE AMENITY VALUE OF TREES AND WOODLANDS

D. R. Helliwell · Arboricultural Association Journal · 1967 · 54 citations

Engineering, Arboricultural Association Journal, Forestry +8

Vegetation establishment on chalk marl spoil: the role of nurse grass species and fertiliser application

Jonathan Mitchley, G. P. Buckley, D. R. Helliwell · Journal of Vegetation Science · 1996 · 48 citations

Plant-soil Interaction, Engineering, Botany +15