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الإتاحة
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المؤلفين
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أنواع المادة
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مواقع
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السلاسل
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مواضيع
- Global warming
- Natural gas - Middle...
- Natural gas - Prices
- Oil fields
- Oil fields - Africa
- Petroleum industry a...
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- Petroleum industry a...
- Petroleum industry a...
- Petroleum industry a...
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- Petroleum products -...
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- Petroleum reserves
- أظهر المزيد
- عرض أقل