Transport Research International Documentation (TRID) https://trid.trb.org/ en-us Copyright © 2024. 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) Transport Research International Documentation (TRID) https://trid.trb.org/Images/PageHeader-wTitle.jpg https://trid.trb.org/ SPECIAL TYPES OF BALLAST https://trid.trb.org/View/18813 Mon, 15 Jul 1974 00:00:00 GMT https://trid.trb.org/View/18813 MINE RAILWAY IN MAURITANIA--9YEARS OF OPERATION BY MIFERMA https://trid.trb.org/View/13078 Fri, 04 Jan 1974 00:00:00 GMT https://trid.trb.org/View/13078