This final occupational safety and health standard, promulgated today as a revised 29 CFR 1910.20, provides for employee, designated representative, and OSHA access to employer-maintained exposure and medical records relevant to employees exposed to toxic substances and harmful physical agents. Access is also assured to employer analyses using exposure and medical records. The final standard requires long term preservation of these records, contains provisions concerning informing employees of their rights under the standard, and includes provisions protective of trade secret information.