I heard that when Stalin’s last NKVD chief, Lavrenti Beria, was purged in the power struggle following Stalin’s death, owners of a Soviet encyclopedia were given a page about the Bering Sea, and told to cover up the page in the encyclopedia about Beria with that.
Sounds about right. Khruschev visited Stalin's deathbed on The Great Helmsman's last night on Earth, weird coincidence. The power struggle between Beria and Khruschev lasted something like six months. Beria's execution came about precipitously, his 'trial' presided over by a WWII general and hero along with some other well-known citizens. Some of Beria's unfinished business consisted of purge victims who remained in prison. The whole bunch and Beria were just snuffed and erased.
Back in the 70s there was a rather large bookstore in lower Manhattan devoted to leftist claptrap. While browsing came across Soviet encylopedia in English and noticed numerous pages with the glued in “corrigenda”. The adhesive must have been the Soviet version of Superglue. Could not be peeled back at all...sure as hell wasn’t paste.
Sidebar: Postwar maps of the USSR including the Baltic Sea showed the entire southern Baltic coastline from Kaliningrad to Finland as being many kilometers seaward from actual locations...wonder how many stayed in circulation after Keyhole sats. BTW, distribution was fir internal use as well as for foreign markets.