Letter from, A Forbes Sieveking, 12 Seymour Street, Portman Square, to Robert [William Frederick] Harrison Regarding permission to print and publish the Manuscripts of John Evelyn's "Designe for a Library, 1.p. Holograph. 22 May, 1661 (xvii. No. 1 Classified Papers) and "The History of Artes Illibereal and Mechanick. 4pp. holograph No. 1. 17 December 1907