Legal status and deprivation in India's urban slums : an analysis of two decades of National Dample Survey data / Laura B. Nolden (Mathematica Policy Research), David E. Bloom (Harvard T.H. Chan School of Public Health and IZA), Ramnath Subbaraman (PUKAR, Brigham and Women's Hospital, and Harvard Medical School) ; IZA, Institute of Labor Economics. Bonn, Germany : IZA Institute of Labor Economics, March 2017