The compendium is divided into 16 environmental categories as indicated in the general table of contents. Each of the 16 environments has its own table of contents subdividing the text into sub-sections organized for a logical presentation of the subject. (See volumes 1-3.) Conversion tables covering physical, biological, and engineering terms used in this compendium follow the last section of the text. (See volume 4.) At the end of the compendium is an alphabetic subject index covering all of the sections. Following each subject notation in the alphabetic index is the environmental section, page number in that section, and also the figure or table number where that subject is covered or even mentioned. In some cases the figure or table may be self explanatory; in others perusal of the test is required for appreciation of the full meaning and utility limits of the figure or table. A table of environments precedes the index for hand reference. (See volume 4.) The areas of research covered include: microwave radiation, light, ionizing radiation, magnetic fields, electric current, thermal environment, acceleration, vibration, sound and noise, oxygen-carbon dioxide-energy, inert gas, pressure, contaminants, nutrition, water, anthropometry and temporo-spatial environment.