African Journals Online
Just found this site, African Journals Online, a collection of journals published in Africa. The objective of AJOL is to give greater visibility to the participating journals, and to the research they convey. The database covers the full range of academic disciplines, but does have a science section.
Earth Science titles include:
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Nigerian Journal of Soil Science
Global Journal of Environmental Sciences
Journal of Mining and Geology
Years available and access vary depending on where you’re located.