TY - BOOK ID - 145775927 TI - Standard reference materials : film step tablet standards of diffuse visual transmission density - SRM 1001 and SRM 1008 AU - Early, Edward A. AU - O'Brian, Thomas R. AU - Parr, A. C. AU - National Institute of Standards and Technology (U.S.) PY - 1998 PB - Gaithersburg, MD : U.S. Dept. of Commerce, National Institute of Standards and Technology, DB - UniCat UR - https://www.unicat.be/uniCat?func=search&query=sysid:145775927 AB - ER -