 Poppe was an exceptionally prolific scholar.A bibliography of his publications from 1924 to 1987 includes 284 books and articles and 205 book reviews.Between 1949 and 1968 — a period during which he was teaching 16 to 17 hours a week at the University of Washington, with only three months in the summer for uninterrupted research — he wrote 217 works, including over 40 books.