The National Research Council is the premier scientific research organization in the United States, and its Bulletin is one of the most authoritative sources of information on a wide range of topics in science and technology. Issues 16-18 cover such subjects as the measurement of farming efficiency, the nutritional value of different foods, and the use of radiation in genetic research. This book is an invaluable resource for scientists, policymakers, and anyone interested in the latest developments in scientific research.

This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it.

This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work.

Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.