How did we keep things cold before refrigeration?

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David, E. (2011). Harvest of the Cold Months: The social history of ice and Ices. https://archive.org/details/harvestofcoldmon0000davi/page/6/mode/2up

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Kish, S. (2021, October 25). How did ancient people store food before refrigeration? livescience.com. https://www.livescience.com/ancient-food-storage

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Wikipedia contributors. (2024, August 18). Refrigeration. Wikipedia. https://en.wikipedia.org/wiki/Refrigeration