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Vertical aggregation is the task of integrating results from specialized search services or verticals into the web search results. Aggregating verticals into the core web results helps in achieving diversity in information search. In this paper various efforts made for selecting relevant vertical and presenting the aggregated results to the users are reviewed. Various vertical selection approaches and design and evaluation of aggregated search interfaces have been discussed which has been a less focused area as compared to the most prior research work in conventional web search interfaces.