1. DMO/ADD/23 Reference (shelfmark): DMO/ADD/23 Title: Yonni Expedition. Staff Diary, Intelligence Report and Medical Report. London: Harrison & Sons, 1888.' 'Confidential. Scope & Content: Relates to Sierra Leone. Collection Area: Map Collections Languages: English Date Range: 1888 Extent: 1 booklet, including 8 maps and 3 views