Try adding the following words to your search to look for resources about specific time periods:
Middle Ages (Medieval) - 5th - 15th centuries
Renaissance: 15th - 16th centuries
Reformation: 16th century
Counter Reformation: 16th - 17th centuries
Enlightenment: 17th - 18th centuries
Industrial Revolution - 18th - 19th centuries
Also try searching by century:
Eighteenth century
18th century
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