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To filter your search, prefix one of the following two letter codes to your search term; VL for Variable/Category Label, TI for Title, KW for Keywords, AB for Abstract, SE for Series.
E.g to search for 'smoking' in the title of a record, add '((TI:smoking))' to the end of the Base the Base URL as follows http://search1.odesi.ca/search?requestURL=((TI:smoking))%26options%3Dodesi-opts2%26format%3Djson
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