TY - RPRT TI - Standardization of thermal emittance measurements : progress report no. 15, January 1 - March 31, 1962 AU - Joseph, Horace M AU - Harrison, William N PY - 1962 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS report ; 7523 DO - 10.6028/NBS.RPT.7523 ER -