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'... adapted from a document entitled "Methodology of trachoma control", which was prepared at the instigation of a meeting on trachoma control activities held in Khartoum in August 1969 and subsequently reviewed by the UNICEF/WHO Joint Committee on Health Policy in February 1972' - Preface.
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Field methods for the control of trachoma. ISBN 0119506378. Published by World Health Organization in 1973. Publication and catalogue information, links to buy online and reader comments.