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Frequently Downloaded Main Categories

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Category: Science-Fiction & Fantasy 4230 books
Category: Science - Biology 1556 books
Science Fiction 1341 books
Category: Science - Physics 579 books
Mathematics 154 books
Category: Mathematics 110 books
Scientific American 86 books
Biology 74 books
Science Fiction by Women 55 books
Women in Science, Technology, Engineering, and Mathematics 47 books
Astronomy 38 books
Precursors of Science Fiction 36 books
Physics 34 books
FR Science fiction 32 books
Chemistry 28 books
Botany 26 books
Physiology 21 books
Natural History 18 books
Zoology 11 books
Geology 10 books
Microbiology 6 books
Ecology 5 books
Mycology 5 books
Microscopy 5 books
IT Botanica 3 books
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