Kumarasamy Thangaraj traveled 840 miles (1,350 km) off of the eastern coast of India by plane, then ship, then six hours by car, then ship again to collect blood samples from an isolated tribe of ...

These caste listings included all professions -- for example, Sonar, a term for goldsmiths, was listed as a backward class. By the 1931 census, the number of recorded castes had risen to over 3,000.