TY - RPRT TI - Separation of the water-soluble degradation products of asphalt AU - Greenfeld, Sidney H AU - Falzone, John P AU - Ishihara, Shigeru PY - 1957 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS RPT 5436 DO - 10.6028/NBS.RPT.5436 ER -