TY - RPRT TI - Standard Reference Materials Boric acid; isotopic, and assay standard reference materials AU - Champion, C E AU - Marinenko, G AU - Sappenfield, K M AU - Catanzaro, E J AU - Shields, W R PY - 1970 PB - National Institute of Standards and Technology CY - Gaithersburg, MD SN - NBS SP 260-17 DO - 10.6028/NBS.SP.260-17 ER -