"Oil flower plants Ethiopia." . . "Oliegewassen." . . "Oils and fats." . . "Äthiopien." . . "Ethiopië." . . "Oilseed plants." . . . . "Ölpflanzen." . . "Oilseed plants Ethiopia." . . "Ethiopia." . . . . . . . . . . . . . "Proefschriften (vorm)" . . . . . . . "Oil Plants In Ethiopia Their Taxonomy And Agricultural Significance" . . . . . . . "Oil plants in Ethiopia : their taxonomy and agricultural significance"@en . . "Includes Dutch summary and English abstract." . . "Oil plants in Ethiopia, their taxonomy and agricultural significance" . . . "Oil plants in Ethiopia, their taxonomy and agricultural significance"@en . . . . . . . "Teknik Økonomi Landbrug." . .