Shared pseudonyms of <a href="https://openlibrary.org/authors/OL8013430A" alt="OL8013430A on Open Libery" target="_blank">C. Hallman</a> and <a href="https://openlibrary.org/authors/OL8484375A" title="OL8484375A on Open Library" target="_blank">J. L. Beck</a>