The ever-increasing rate of scientific research throughout the world, and particularly in the United States, is a well-known fact. This increase is partly evidenced by the growing number of books, papers, and reports published every year. Indeed, we are faced with an information retrieval problem. If the results of a piece of scientific work are to provide useful knowledge, the expository technical papers or reports must be generally known and available, and they must be capable of being understood and evaluated by the reader (the problem of language is included here). The present monograph attempts to bridge these gaps in one field—the vibration of plates.