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Levels are estimates for original works, not graded adaptations. Only English texts with a valid measurement use our Flesch heuristic.

79,717 books found

Page 15
ENB2 · Estimated

Report on the Radiolaria Collected by H.M.S. Challenger During the Years 1873-1876, Second Part: Subclass Osculosa; Index Report on the Scientific Results of the Voyage of H.M.S. Challenger During the Years 1873-76, Vol. XVIII

Haeckel, Ernst