Analysis of information sources in references of the Wikipedia article "Widener Library" in English language version.
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When Widener was built ventilation for books was emphasized, possibly to prevent mold; thus a slit ran along the base of every row of shelves, allowing air to flow from the floor below. Unfortunately books, papers and objects were prone to fall through these slits,[67]: 135 and "the whole installation might have been regarded as a large collection of chimneys that would help a fire to spread rapidly from floor to floor." The slits were later closed.[68]: 92–93