The 11th edition consists of 20 sections:
"Harvard Professors at MIT". Harvard Alumni Bulletin. Vol. 17, no. 5. Harvard Alumni Association, Associated Harvard Clubs. 1914-10-28. https://books.google.com/books?id=JyTPAAAAMAAJ&pg=PA79 ↩
Avallone, Eugene A.; Baumeister III, Theodore; Sadegh, Ali M., eds. (2007). Marks' Standard Handbook for Mechanical Engineers (11th ed.). New York, USA: McGraw-Hill. ISBN 978-0-07-142867-5. 978-0-07-142867-5 ↩