How people kept stuff cold before refrigerators

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"Before the Refrigerator: How We Used to Get Ice," Jonathan Rees: https://jhupbooks.press.jhu.edu/title/refrigerator

Kevin McGurn's Boston snow pile time-lapse: https://youtu.be/-2KdwdMzxBg

Ridley Scott's "Kingdom of Heaven" (2005), I recommend the director's cut version: https://www.amazon.com/Kingdom-Heaven-Directors-Roadshow-Version/dp/B00UMD560E