Currently, she has a small consultancy that organizes study tours to India for foreign visitors.

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Last year 18m people took part in nature-study tours in Texas, many of them to ranches.

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All the first-year students at the Airship Academy had been shipped out on two-week training tours to study navigation.

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However the Cruise Scotland study said dockside facilities and the tours on offer needed to be improved.

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Wells began leading tours in Paris more than 10 years ago, most of her guests were university study-abroad groups.

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Bowler, a Thailand-based Australian, has run half a dozen of the tours in recent years, during which participants are taught the basics of Islamic practice, study Islamic history and calligraphy, pray in mosques and live and eat with Muslim families.

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