TY - RPRT TI - Refrigeration and field equipment : progress report for quarter ending April 6, 1957 AU - Phillips, C W AU - Achenbach, P R PY - 1957 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS RPT 5283 DO - 10.6028/NBS.RPT.5283 ER -