Correspondence and papers from a folder labelled, 'Chapman Hall Ltd.' Material comprises, one folder of general correspondence between ZK and publishers Chapman Hall Ltd., London; and four further folders, each one representing ZK publications, reprints, and ideas for publications. These are:
- Numerical Analysis, (first edition published, 1955).
- Close Binary Systems, (first edition published, 1959).
- The Course of Space Research, an unpublished book.
- The International Astrophysics journal series.
- The Moon, (first edition published, 1960).
Material includes a draft of a chapter for Numerical Analysis.