This article argues for the use of teacher-generated corpora in content-based courses. Using a content course for engineering and architecture students as an example, the article explains how a corpus consisting of texts from textbooks and journal articles helped students learn grammar, vocabulary, and writing. The article explains how the corpus was compiled and presents examples of how students learned to analyze language use using corpus tools and dictionaries. The article ends by emphasizing the advantages of corpus analysis for self-directed learning.