In addition, Brooks's and Warren's collaboration led to innovations in the teaching of poetry and literature. At Louisiana State University, prompted by their students' inability to interpret poetry, the two put together a booklet that modeled close reading through examples (Leitch 2001). The booklet was a success and laid the foundation for a number of best-selling textbooks: "An Approach to Literature" (1936), "Understanding Poetry" (1938), "Understanding Fiction" (1943), "Modern Rhetoric" (1949), and, in collaboration with Robert Heilman, "Understanding Drama" (1945). Brooks' two most influential works also came out of the success of the booklet: "Modern Poetry and the Tradition" (1939) and "" (1947) (Leitch 2001).