TY - RPRT TI - Circular of the Bureau of Standards no. 556: thermal conductivity of metals ad alloys at low temperatures- a review of the literature AU - Powell, Robert L PY - 1954 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS CIRC 556 DO - 10.6028/NBS.CIRC.556 ER -