Occurrence of Attributes in Original Text

The text related to the cultural heritage 'The Slate Landscape of Northwest Wales' has mentioned 'Trade' in the following places:
Occurrence Sentence Text Source
By the second half of the 16th century, there was a small export trade of slates to Ireland from ports such as Beaumaris and Caernarfon.
it accounted for almost half the total revenues from trade, industry and the professions, and in Wales as a whole, its output value compared with that of coal.
A rybelwr would usually be a boy learning his trade, who would wander around the galleries offering assistance to the gangs.
[62] In addition, several countries had placed tariffs on the import of British slate, while a slump in the home building trade had reduced domestic demand; finally French slate producers had increased their exports to the United Kingdom.
The outbreak of World War II in 1939 led to a severe drop in trade.