Research in Progress (RIP) https://rip.trb.org/ en-us Copyright © 2026. National Academy of Sciences. All rights reserved. http://blogs.law.harvard.edu/tech/rss tris-trb@nas.edu (Bill McLeod) tris-trb@nas.edu (Bill McLeod) Research in Progress (RIP) https://rip.trb.org/Images/PageHeader-wTitle-RIP.jpg https://rip.trb.org/ Subbase Requirements for Utilizing Unsealed Joints in PCCP https://rip.trb.org/View/1363410 Thu, 30 Jul 2015 01:01:12 GMT https://rip.trb.org/View/1363410