TY - RPRT TI - Nonmetallic coatings for concrete reinforcing bars: quarterly progress report no. 1 September 17 to December 31, 1971 AU - Clifton, James R AU - Cilimberg, Ramon L PY - 1972 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS RPT 10690 DO - 10.6028/NBS.RPT.10690 ER -