TY  - BOOK
AU  - Walker, Richard D.
AU  - Larson, Thomas D., couat.
ED  - E.U.A. National Research Council. Highway Research Board.
TI  - Research needs relating to performance of aggregates in hig-hway construction / Richard D. Walker , Thomas D. Larson
CY  - Washington, D.C. : HRB
ER  -