'... archives of the family of Sidney of Penshurst ..
'Since this catalogue was compiled a further large deposit of papers has been received concerning the Foulis family of Inglesby Greenhow in N. Yorkshire ... The whole De L'Isle MSS. will ... comprise U1475 being those Sidney papers formerly deposited with the H[istorical.] M[anuscripts] C[ommission] ; U1500 those Sidney papers which were left at Penshurst Place ; U1886 the Foulis MSS., yet to be catalogued'.
De L'Isle MSS. : deposited by the Rt. Hon. the Viscount De L'Isle, V.C., September 1969 [in the] Kent Archives Office. Part 1. ISBN 0900947594. Published by Kent Archives Office in 1974. Publication and catalogue information, links to buy online and reader comments.