By this time Solzhenitsyn had been a resident of the USA for some years and was therefore able to publish chapters hitherto suppressed, as well as new parts written after extensive research at the library of the Hoover Institution.
By this time Solzhenitsyn had been a resident of the USA for some years. He was able to publish chapters that had been suppressed while he was still living in Russia, given the Soviet censorship of literature, and to add material based on his extensive research at the library of the Hoover Institution.