As mentioned in another top-level comment, the explosives were actually novels -- a bit of a play on words there, clearly. One interesting thing to me, was to

As mentioned in another top-level comment, the explosives were actually novels -- a bit of a play on words there, clearly. One interesting thing to me, was to read that millions of copies of Orwell's Animal Farm were distributed from West Germany via 10-foot (diameter?) balloons, which were subsequently targets of communist airforces.