TY - RPRT TI - A comparison of two testers in evaluating the slip-resistance of bathtub and shower base surfaces AU - Brungraber, Robert J AU - Raper, Theresa J R PY - 1977 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS IR 76-1005 DO - 10.6028/NBS.IR.76-1005 ER -