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In page Book:
"Steam-powered printing presses became popular in the early 19th century. These machines could print 1,100 sheets per hour,[1] but workers could only set 2,000 letters per hour.[citation needed] Monotype and linotype typesetting machines were introduced in the late 19th century. They could set more than 6,000 letters per hour and an entire line of type at once. There have been numerous improvements in the printing press. In mid-20th century, European book production had risen to over 200,000 titles per year.
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