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The 1999 Supplement to the Documentation of the Threshold Limit Values and Biological Exposure Indices, 7th Edition contains Documentation for the substances, with their corresponding values and notations, that were on the Notice of Intended Changes for 2001, and have been approved and adopted as Threshold Limit Values (TLVs®) and Biological Exposure Indices (BEIs®). A revised copyright page and Table of Contents page (with the new TLVs® incorporated) are also included. The pages of the Supplement are in a three-hole punched format that can be easily inserted into the Documentation binder.