Chittagong Hill Tracts manual
Chittagong Hill Tracts Regulation, 1900 (Act 1 of 1900) popularly known as Chittagong Hill Tracts manual is a manual enacted by the then British India Government describing how to administer the Chittagong Hill Tracts of present-day eastern Bangladesh. It was adopted in place of earlier manuals, after the government realised that the act of 1860 would not work satisfactorily.
Source: Wikipedia — Chittagong Hill Tracts manual (CC BY-SA 4.0)