5 Volume Set The seventh edition of the Documentation of TLVs® and BEIs® is easier to use, and contains more useful information, presented in a more user-friendly format than earlier versions. The Documentation provide the basic rationale for the development of TLVs® for chemical substances and physical agents and of BEIs® for selected chemicals. Specific new features include: ·A "Summary" of each chemical substance TLV® Documentation, similar to the Abstract of scientific papers published in journals. This summary brings together the principal points upon which the TLV® is based, and cites the potential health risks that the TLV® is designed to minimize. ·Tables of the history of values for each agent (new for the Biological Exposure Indices (BEIs®) and physical agents TLVs®; reformatted for the chemical substance TLVs®). ·More complete and up-to-date Introductions to the chemical substance TLV®, BEI®, and physical agents TLV® sections. SUPPORT ACGIH® AND THE TLVs®!