What is the fine-grained topic of the following text: In the 1970s they were the first merchants – of any nationality – to prospect and buy wine from the wine regions of southern France … Bergerac, Duras, Cahors, Madiran, Gaillac, Minervois, Saint-Chinian and so on eastwards. Only return the topic.
Buying wine from southern France in the 1970s.