تنقيح بحثك
الإتاحة
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المؤلفين
-
أنواع المادة
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مواقع
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أماكن
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مواضيع
- Biotechnology
- Climatic changes
- Command and control ...
- Defense industries
- Fishery management
- Global environmental...
- Global warming
- Greenhouse Effect
- Greenhouse effect, A...
- Hazardous waste site...
- Marine ecology
- Navy-yards and naval...
- Nuclear arms control
- Oceanography - Resea...
- Oceanography - Resea...
- Sustainable developm...
- Sustainable fisherie...
- Terrorism
- Water resources deve...
- Water-supply
- أظهر المزيد
- عرض أقل