1. DMO/1 Reference (shelfmark): DMO/1 Title: DMI Secret. 'General Subjects' Collection Area: Map Collections Languages: English Date Range: 1886-1890 Extent: 1 volume
2. DMO/2 Reference (shelfmark): DMO/2 Title: DMI Secret. 'France' Collection Area: Map Collections Languages: English Date Range: 1888-1890 Extent: 1 volume
3. DMO/3 Reference (shelfmark): DMO/3 Title: DMI Secret. 'Colonies' Collection Area: Map Collections Languages: English Date Range: 1879-1890 Extent: 1 volume
4. DMO/4 Reference (shelfmark): DMO/4 Title: DMO Secret. General Subjects I Collection Area: Map Collections Languages: English Date Range: 1886-1892 Extent: 1 volume
5. DMO/5 Reference (shelfmark): DMO/5 Title: DMO Secret. General Subjects II Collection Area: Map Collections Languages: English Date Range: 1893-1896 Extent: 1 volume
6. DMO/6 Reference (shelfmark): DMO/6 Title: DMO Secret. General Subjects III Collection Area: Map Collections Languages: English Date Range: 1896-1901 Extent: 1 volume
7. DMO/7 Reference (shelfmark): DMO/7 Title: DMO Secret. General Subjects IV Collection Area: Map Collections Languages: English Date Range: 1901-1905 Extent: 1 volume
8. DMO/8 Reference (shelfmark): DMO/8 Title: DMO Secret. Foreign Countries: Africa, America Collection Area: Map Collections Languages: English Date Range: 1887-1904 Extent: 1 volume
9. DMO/9 Reference (shelfmark): DMO/9 Title: DMO Secret. Foreign Countries: Asia Collection Area: Map Collections Languages: English Date Range: 1889-1905 Extent: 1 volume
10. DMO/10 Reference (shelfmark): DMO/10 Title: DMO Secret. Foreign Countries: Europe (except France and Russia) Collection Area: Map Collections Languages: English Date Range: 1885-1905 Extent: 1 volume