Resources: BBC and Yellowstone National Park audio libraries.

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The BBC and Yellowstone National Park have both recently released extensive archives of sound effects into the public domain; you never know when you might have occasion to know the exact sound of a grizzly crunching bison bones, the klaxon of a Romanian trolleybus, a shot from an 1870 17-bore twin-barrel shotgun, or the moaning of a frozen lake as the ice reacts to temperature fluctuations:

https://sound-effects.bbcrewind.co.uk/

https://www.nps.gov/yell/learn/photosmultimedia/soundlibrary.htm