In response to Frank Kover's request for information on sulfolane, I am enclosing printouts from appropriate NIOSH databases obtained by Ruth Grubbs, of my staff. Printouts from both NIOSHTIC and the NIOSH Current Research File (CRF) are included for toluene diisocyanate. However, only the NIOSHTIC printouts are included for methylene diphenyl-diisocyanate and sulfolane, since neither chemical appeared in the CRF. While the CRF is NIOSH's primary source of unpublished data, some unpublished documents may also appear in NIOSHTIC. In addition, you may be interested in some of the older, foreign, or otherwise unique publications cited in NIOSHTIC.