OSHA 1926 Subpart D Textbook for Occupational Health and Environmental Controls, Subpart D Book 1, Volume 1, 2015 Edition. Overview and Description of Work provides educational lecture information and material for Medical Services and First Aid (1926.50); Sanitation (1926.51); Occupational Noise Exposure (1926.52); Ionizing Radiation (1926.53); Nonionizing Radiation (1926.54); gases, vapors, fumes, dusts, mists (1926.55); Illumination (1926.56). The e-CFR OSHA reference source document applicable to this Work is includes with this Work in the event of any need.