Yazar
Paul D Duffy
2 cilt bulundu.
Cilt sonuçları
Fertilization to accelerate loblolly pine foliage growth for erosion control
Paul D Duffy · Dept. of Agriculture, Forest Service, Southern Forest Experiment Station
Sayfa sayısı yok · 1977
Loblolly pine / Soil conservation / Fertilizers
Some hydrologic properties of Grayling sand in northern lower Michigan
Paul D. Duffy, University of Michigan. School of Natural Resources. · Yayınevi bilinmiyor
58 sayfa · 1960
Soil moisture / Sandy soils