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Caves' as in most plural possesives.

E.g. The Mendip Hills' caves' streams were traced in the Mendip Karst Hydrology Project.

Though that example (referring to a study carried out in the 1960s) would be more euphonious ifcaves' was replaced by cave,turning the word from noun to adjective and removing an awkward conjoined-s.)

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12y ago

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