A file of correspondence, reports and memoranda concerning the renegotiation of the conditions within the Berlin air corridor in the aftermath of the Lincoln bomber incident. The documents include a letter from a relative of one of the Lincoln pilots; the minutes of the third four-party talk during which proposals were made to avoid the shooting down of aircraft straying out of the corridor; information regarding how British airmen were instructed to act when encountering Soviet aircraft; and a rejection of Soviet portrayals of the talks as having a "friendly atmosphere." Other documents discuss the views of Winston Churchill, the British prime minister, on the Lincoln bomber incident; further reference to the original establishment of the corridor dating from 1946; the proposition to hold a further round of four-party talks; and a ratification of the rules to be followed by aircraft within the corridor.