As with other series shelfmarked MS. Ch. and MS. Rolls, this is an artificial collection created from a range of archival sources, and the provenance of individual items is not always known.

The collection catalogued in 1878 comprised MSS. Ch. Ir. 1-8 and Rolls Ir. 1-3, of unrecorded provenance. MS. Ch. Ir. 6 is identifiable in the collection of Ralph Thoresby (described more fully in the collection overview for Yorkshire). There have been no subsequent accessions.

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