"Soon the book's blue linen covers were found littering the fairgrounds. Some who got the novel were ripping off the cover, dividing the pages and stuffing them into their pockets to make the book easier to hide," The Zhivago Affair says.
I wonder if the person heading up the operation at the CIA gave any thought to producing and distributing it in a more easy to conceal and smuggle format, or if that would have been too James Bond even for them.
Edited to add:
Should have finished TFA before posting.
...the CIA decided to produce its own Russian-language, miniature paperback version in the US, under the name of a fake French publishing house.
Copies of it were given to Soviet and East European students at the 1959 World Festival of Youth and Students in Vienna, which was sponsored by Communist organisations.
The Soviet "researchers" who accompanied the young people from the USSR reportedly said: "Take it, read it, but by no means bring it home."