44 SOCIAL SCIENTIST NOTES 1. A detailed review of the concepts and definitions used in the Census of 1961, 1971, 1981 and NSS Rounds and problems of comparability among them is available in Unni (1989). 2. For 1977-78, Sundaram has worked out age-standardised WPR of rural females for all major states. For a detailed account of changes in WPR, between 1961 Census and later NSS Rounds at the state level, see Sundaram (undated). 3. The 1961 census estimates of agricultural labourers are sometimes said to be underestimates due to a mix up in the Census enumeration. However, a comparison with the 16th (1960-61) and the 17th (1961-62) NSS Rounds indicates that this under-enumeration was not significant. Also, these estimates are in line with later NSS surveys of 1972-73, 1977-78 and 1983. For a detailed comparison of these estimates please see Unni (1989). 4. A detailed discussion of changes in employment among rural labour households is available in Unni (1988). 5. In the first two RLEs, the usual occupation of a person was identified as the gainful occupation which he usually pursued irrespective of what he may be doing at the time of interview or during the reference period of the preceding week. In the RLE of 1977-78, however, the major time criterion was introduced. A person's usual occupation was identified as the occupation he pursued over the major time of the 365 days preceding the date of interview. This change in the definition is likely to have reduced the number of usually occupied persons captured in the RLE 1977-78. 6. Data on workers in rural labour households by land status were not available for 1964-65, hence these data are presented for agricultural labour households only. 7. Data for 1977-78 was collected for a large sample of labour households in rural areas with the Employment-Unemployment Survey of the 32nd Round. The idea of collecting information on incomes of these households was however dropped. Hence we do not have data on household incomes for 1977-78. 8. For a detailed analysis of wage earnings and household incomes of these rural labour households see Unni (1988). 9. This survey was conducted as a part of a project undertaken by the Gujarat Institute of Area Planning. For details of the survey villages and project area see Basant (1988). 10. To save space the table showing the distribution of workers by subsidiary activity and major source of household income is not given in the paper. REFERENCES '•> Basant, Rakesh Agro-Mechanical Technology in a Developed Area: A Study of its Diffusion, The Gujarat Institute of Area Planning, Ahmedabad, 1988. Dixon, Ruth Rural Women at Work: Strategies for Development in South Asia, John Hopkins University Press, 1978. Sundaram, K., 'An Analysis of Changes in Work Force Participation Rates of Rural Women in Major States of India (1961-1983)', Asian Employment Programme, ILO/ARTEP, New Delhi, undated. Unni, Jeemol, 'Agricultural Labourers in Rural Labour Households, 1956-57 to 1978-79, Changes in Employment, Wages and Incomes', Economic and Political Weekly, June 25,1988, Review of Agriculture. —, 'Changes in Women's Employment in Rural Areas, 1961-83', Economic and Political Weekly, April 29, 1989, Review of Women's Studies. Visaria, Pravin, 'The Growth of Population and Labour Force in India: 1961-2000', a paper presented at the workshop on Population Growth and Labour Absorption in the Developing World 1960-2000, Bellagio, July 1-6, 1984.