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CAMBRIDGE, England — The papers spent years hidden in a milk churn beneath a Russian dacha and read like an encyclopedia of Cold War espionage.

Original documents from one of the biggest intelligence leaks in history — a who’s who of Soviet spying — were released Monday after being held in secret for two decades.

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The files smuggled out of Russia in 1992 by senior KGB official Vasili Mitrokhin describe sabotage plots, booby-trapped weapons caches and armies of agents under cover in the West — the real-life inspiration for the fictional Soviet moles in “The Americans” TV series.

In reality, top-quality spies could be hard to get. The papers reveal that some were given Communist honours and pensions by a grateful USSR, but others proved loose-lipped, drunk or unreliable.

Intelligence historian Christopher Andrew said the vast dossier, released by the Churchill Archives Centre at Cambridge University, was considered “the most important single intelligence source ever” by British and American authorities.