First published in 1939, An Essay on India's National Income: 1925-1929 by V. K. R. V. Rao is a pioneering study of India's economic structure during the late colonial period. The book meticulously examines income sources across agriculture, livestock, forestry, mining, industry, transport and trade employing innovative statistical methods for its time. Rao critiques previous estimates, provides detailed deductions, and offers a comprehensive analysis of national income. A foundational work for economic historians and researchers.