This range was reserved for maps acquired after 1878, entered in margins or on interleaves in office copies of the catalogue, but subsequently discarded from the collection on supersession
This range contains maps subsequently identified in the collection as having entered the IO Maps collection before 1947, mainly from other departments, but not then entered in margins or interleaves of copies of the published catalogue.
This range contains items known to have been elsewhere in the India Office before 1947, but transferred to the IO Maps collection only after 1947. References IOR/X/12000 and IOR/X/12209 have not been used.
This range contains maps acquired by, or transferred to, the India Office Library and Records in the FCO between 15 August 1947 and 31 December 1973. Items acquired by gift or purchase, in common with all such acquisitions of books and private papers by the India Office Library and Records durin...
This range contains maps and associated documents acquired by, or transferred to, the India Office Records, in the FCO between 1 January 1974 and 31 March 1982 and in The British Library after 1 April 1982. Numbers IOR/X/14006-14018 not used: items transferred to IOR/X/12000 series and to IOR/W...