TY - RPRT TI - Long-term performance of engineered concrete barriers AU - Clifton, James R AU - Pommersheim, James M AU - Snyder, Kenneth PY - 1995 PB - National Institute of Standards and Technology CY - Gaithersburg, MD SN - NIST IR 5690 DO - 10.6028/NIST.IR.5690 ER -