13. ‘South Arabia. Anglo-Turkish Boundary. Sheet No. 4’ Date: 1914/1914 Language: English Geographic region: Yemen
15. ‘Letters from India (Secret Dept)’, Vol. 13 Date: 1871/1872 Language: English Geographic region: NejdZanzibarYemen
20. ‘Aden. Sketch containing Historical and Political information of.’ Date: 1833/1845 Language: English Geographic region: AdenYemen
22. 'File 23/2 A Saudi-Yemen Situation Reports issued by Minister, Jeddah.' Date: 1934/1934 Language: English Geographic region: Saudi ArabiaYemen
23. ‘File 25/3 Agreement between UK and Italy’ Date: 1938/1938 Language: English Geographic region: Suez CanalYemenMediterranean Sea