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Singapore Concrete Institute (16th: Singapore: 1987)
Geological society of London (23rd : 1987 : Nottingham England)
SYMPOSIUM on sustainability issues in agricultural development (7th: 1987: Washington)
INTERNATIONAL symposium on the plant population Ecology (28th: 1987: Sussex)
Sessional paper no. iv - 1987
Session paper no. viii - 1987
Annual Health Bulletin 1987
International conference on stability of amorphous silicon alloy materials and devices (157: 1987: California)
PROCEEDINGS of the expert consultation on the eradication of ticks with special referece to Lati America (1987: Mexic)