Folder B.5.1: Correspondence regarding arrangements for delivery of lecture, and invitations to Coulson to speak at universities in the area. Folder B.5.2: Transcripts of the 4 lectures and of the discussions following the lectures. Folder B.5.3: MS. drafts of the 4 lectures. Brochure advertising the series. Folder B.5.4: Notes and supplementary material collected by Coulson in preparing lectures for publication. Correspondence with editors of Columbia...