摘要：This third cumulation differs considerably in format from the former two. It is larger and in many ways more easily read and used. Gone are the bold face type subject headings and in their place are underlined headings and subheadings. These are not as easily discernable and the brief explanation given them is inadequate. Subject headings have been somewhat revised (e.g. Medicine, Preventive is now Preventive Medicine) and the "see also" cross references have been more appropriately placed immediately following the subject heading.
