13. ‘Trigonometrical plan of the harbour of El Biddah on the Arabian side of the Persian Gulf. By Lieuts. J. M. Guy and G. B. Brucks, H. C. Marine. Drawn by Lieut. M. Houghton’ Date: 1823/1823 Language: English Geographic region: El Biddah
14. 'Memorandum by Mr Bertie on Questions with the Porte in the Persian Gulf, August 1892 to October 1893.' Creator: Author: Francis Leveson Bertie, 1st Viscount Bertie of Thame Date: 1893/1893 Language: English Geographic region: BahreinFaoEl KatrEl Bidaa
15. 'Persian Gulf précis. (Parts I and II)' Date: 1913/1913 Language: English Geographic region: البحرينالكويتجوادرالأحساءالساحل المتصالحالبدعقطرمسقط
16. '33 File 665 Hostilities between Shaikh Zaid and Shaikh Jasim' Date: 1888/1890 Language: English Geographic region: QatarAbu DhabiAl BiddaOdaid
17. '34 File 666 Threatened invasion of Oman by Ibn Rashid' Date: 1888/1889 Language: English Geographic region: OmanTrucial CoastNajdEl Bida