Yazar
l j gregorich
5 cilt bulundu.
L. J. Gregorich · Centre for Land and Biological Resources Research
138 sayfa · 1995
Soil degradation / Soils / Quality / Dégradation / Qualité
D. R. Coote, L. J. Gregorich · Agriculture and Agri-Food Canada. Research Branch
173 sayfa · 2000
Water / Water quality / Pollution / Water-supply, Rural
L. J. Gregorich · Canadian Wildlife Federation
117 sayfa · 1992
Game laws / Law and legislation / Poaching / Wildlife conservation
L. J. Gregorich, T. McRae · Agriculture and Agri-Food Canada
19 sayfa · 2000
Sustainable agriculture / Agriculture / Agricultural ecology / Aspect de l'environnement / Agriculture durable
L. J. Gregorich, T. McRae · Agriculture and Agri-Food Canada
224 sayfa · 2000
Sustainable agriculture / Agriculture / Agricultural ecology / Environmental aspects / Écologie agricole