This is a creditable publication. It is not a revised edition, but the author describes two important developments which have taken place since the book was first published in 1943. The reverse numerical filing system is fully described, and the development of shelving especially adapted to medical records is discussed. In addition, the author deals with the purposes and management of the unit record system. This book will contribute materially to the work of the medical record librarian if she is using, or contemplating adoption of, the unit record system of filing.