TY - BOOK ID - 136286671 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 - Saunders, Robert D. PY - 1998 PB - Gaithersburg Department of commerce. National institute of standards and technology DB - UniCat UR - https://www.unicat.be/uniCat?func=search&query=sysid:136286671 AB - ER -