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120 pages first pub 2018 (editions) user-added

nonfiction science challenging informative medium-paced
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96 pages first pub 2019 (editions)

nonfiction science challenging informative medium-paced

113 pages first pub 2019 (editions)

nonfiction science challenging informative medium-paced

160 pages first pub 2019 (editions)

nonfiction science challenging informative medium-paced