The initial deposit covers the period 1813-1976, though the records for the nineteenth century are fragmentary. It has been summarised as follows:
- 1-70: Miscellaneous papers including legal and financial records and letters from authors 1813-1955
- 71-102: Directors'correspondence with authors 1925-1957
- 103-131: Miscellaneous correspondence arranged alphabetically 1928-1968
- 132-361: Miscellaneous papers including correspondence relating to particular books, out-letter books, letters from authors, accounts of Chiswick Press, balance sheets, stock lists 1838-1972
- 362-536: Richard Bell's correspondence 1946-1953
- 537-2062: S.L. Dennis's correspondence 1939-1973
- 2063-2075: Miscellaneous correspondence 1964-1973
- 2076-3154: A.W. Ready's correspondence 1941-1965
- 3155-3467: A.W. Ready's and R.J.B. Glanville's correspondence 1936-1940
- 3468-4119: R.J.B. Glanville's correspondence 1946-1966
- 4120-4567: Central files, mainly correspondence of R.J.B. Glanville and W.H. Mills 1965-1973
- 4568-4694: Miscellaneous book files, mainly correspondence of M.H. Varvill 1958-1973
- 4695-5400: Division files 1926-1929
- 5401-6231: Division files 1930-1932
- 6232-6695: Division files 1933-1935
- 6696-7078: Division files 1936-1938
- 7079-7221: Directors' correspondence with authors 1938-1968
- 7222-7295: Editorial Department correspondence 1927-1934
- 7296-7397: R.J.B. Glanville's foreign rights correspondence 1937-1974
- 7398-7473: Richard Bell's and R.J.B. Glanville's correspondence about American rights, other subsidiary rights, review copies of books and related matters 1953-1955
- 7474-7528: R.J.B. Glanville's American rights correspondence 1956-1964
- 7529-7689: Production Department correspondence 1955-1970
- 7690-7787: Reviews 1957-1966
- 7788-7796: General correspondence about copyright 1938-1946
- 7797-7814: Correspondence about paperback and other subsidiary rights 1963-1976
- 7815-7822: Miscellaneous papers
MS 3741 consists of a further five boxes of correspondence, financial documents, photographic material and other papers. This part of the collection has yet to be catalogued, but there is an index to the autograph letters, which cover the period c. 1840-1920. In addition to the authors listed in this index, there are a number of letters from the children's author Margaret Gatty.