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The Google Books Ngram Viewer is a data mining tool that searches datasets derived from Google Books to generate frequency charts of language usage from the dawn of print until the present time. The available languages are English, French, German, Hebrew, Italian, Spanish, Chinese, and Russian. With a database in excess of two trillion words, it is the largest corpus of linguistics information in existence. In spite of concerns about the reliability of metadata used in Ngram Viewer, it is still viewed as a valuable resource for research into long-term cultural trends.
Anna L. Shparberg (Thu,) studied this question.