TY - RPRT TI - Nonmetallic coatings for concrete reinforcing bars: interim report no. 4 screening tests for evaluating materials AU - Clifton, James R AU - Mathey, Robert G PY - 1971 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS RPT 10968 DO - 10.6028/NBS.RPT.10968 ER -