‘Qatar Digital Library‘ is a free digital archive of cultural and historical heritage of the Gulf developed by Qatar Foundation, Qatar National Library and The British Library.

Below is a paragraph straight from the site about what you can find in it.

WHAT CAN I FIND IN THE QDL?

Content currently available on the QDL was developed during the first phase of the partnership, reaching a total of 500,000 images by the end of 2014. More content is being added all the time, but current highlights the QDL is proud to showcase include:

• India Office Records that span the period 1763–1951, comprising files from the Bushire PoliticalResidency Records and the Bahrain Agency Records
• J. G. Lorimer’s Gazetteer of the Persian Gulf , Oman and Central Arabia (1908, 1915), a classic introduction to the history of the Gulf
• 500 maps, charts and plans of the Persian Gulf and the wider region
• The Private papers of Sir Lewis Pelly, Political Resident in the Persian Gulf between 1862 and 1872
• Arabic Scientific Manuscripts from the British Library’s Manuscripts Collections, covering topics such as medicine, mathematics, astronomy and engineering
• A selection of photographs, postcards and other printed objects as well as sketches, drawings and watercolours; etchings, engravings and illustrations
• A selection of audio collection materials including 200 shellac discs recorded in Bahrain, Kuwait and Iraq between 1920 and 1940