I. N. Socio Econ Trivandrum,
“Progress report April - September 1997 [SEU Foundation]”. Socio-Economic Unit Foundation, Trivandrum, India, p. 40 p. : 4 box., 2 fig., 2 tab., 1997.
I. N. Socio Econ Trivandrum,
“Study on functionality and utilisation of household and institutional latrines in Tamil Nadu”. Socio-Economic Unit Foundation, Thiruvananthapuram, India, p. iv, 60 + annexes (ca. 20 p.) : 2 maps, drwngs, fig., tab., 1997.