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The decrease of lake Chad as documented during twenty years of manned space flight
Mohler, Robert R.J., Helfert, Michael R., Giardino, John R.Volume:
4
Language:
english
Journal:
Geocarto International
DOI:
10.1080/10106048909354201
Date:
March, 1989
File:
PDF, 661 KB
english, 1989