Сурет:Justus von Liebig NIH.jpg

Бұл туынды АҚШ-тың қоғамдық қазынасы және бұл елдерде авторлық құқық сақталу мерзімі авторы қайтыс болғанына 70 жылдан асқан немесе одан аз болады.

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