TY - RPRT TI - Letter Circular 530: salt spray test AU - Mutchler, WH AU - Buzzard, RW AU - Strausser, PWC PY - 1938 PB - National Institute of Standards and Technology CY - Gaithersburg, MD SN - LCIRC 530 DO - 10.6028/NBS.LCIRC.530 ER -