India Office Records

The India Office Records are a very large collection of documents relating to the administration of India from 1600 to 1947, the period spanning Company and British rule in India. The archive is held in London by the British Library and is publicly accessible.

The records come from four main sources: the English and later British East India Company (1600–1858), the Board of Control (1784–1858), the India Office (1858–1947), and the Burma Office (1937–1948). The collection also includes records from many smaller related institutions. Overall, the collection is made up of approximately 175,000 items, including official publications and records, manuscripts, photographs, printed maps and private papers. These items take up approximately nine miles of shelving units.

More information on the Wikipedia page