TY - RPRT TI - Letter Circular 422: the painting of structural metal (steel, galvanized metal, tin plate and copper) AU - Walker, Percy H AU - Hickson, EF PY - 1934 PB - National Institute of Standards and Technology CY - Gaithersburg, MD SN - LCIRC 422 DO - 10.6028/NBS.LCIRC.422 ER -