- FondsCrook - Papers of John Anthony Crook
- SeriesD - Correspondence
- SubseriesD1 - Files of letters mostly to, with some from JAC, arranged alphabetically by sender/recipient
- File4 - Box 4, Letters K-O
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- Item58 - TLS from Juan Pablo Lewis, Santa Fe, Rosario, Argentina.
- Item59 - TLS from Juan Pablo Lewis, Santa Fe, Rosario, Argentina.
- Item60 - TLS from Juan Pablo Lewis, Santa Fe, Rosario, Argentina.
- Item61 - ALS from Andrew Linnett, Worcester College, Oxford.
- Item62 - ALS from Andrew Linnett, Worcester College, Oxford.
- Item63 - ALS from Andrew Linnett, Worcester College, Oxford.
- Item64 - ALS from John Crook to Andrew Linnett.
- Item65 - ALS from Andrew Linnett, Worcester College, Oxford.
- Item66 - TLS from Darrell T. Liu, Institute of Biological Chemistry, Academia Sinica, Taiwan.
- 112 more...