Аммониты и биостратиграфия нижнего келловея Русской платформы

Аммониты и биостратиграфия нижнего келловея Русской платформы

144 Pages · 2000 · 3.76 MB · Russian
by Митта В.В.
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“ Courage doesn't always roar. Sometimes courage is the quiet voice at the end of the day saying, "I will try again tomorrow." ” ― Mary Anne Radmacher
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