Textbook
A textbook is a manual of instruction or a standard book in any branch of study. They are classified by both the target audience and the subject. Textbooks are usually published by specialty printers to serve every request for an understanding of every subject that can be taught. It is a big business that requires mass volume sales to make the publications profitable. Although most textbooks are only published in printed format with hard covers, some can now be viewed online.
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Textbooks emerged as teaching instruments with Johann Gutenberg's invention of the printing press. Early textbooks were used by teachers, who relied on the books for lesson guidance. Later books were printed for children, and have become the primary teaching instrument for most children since the 19th century.
Related Topics:
Johann Gutenberg - Printing press - 19th century
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