TY - SER AU - P Barnes C2 - Astm Intl , PA, DA - 1999-01-01 LA - en PB - Astm Intl , PA, PY - 1999 TI - American Society for Testing and Materials (ASTM E 259-98) Standard Practice for Preparation of Pressed Powder White Reflectance Factor Transfer Standards for Hemispherical and Bi-Directional Geometries ER -