© 1962 by The Johns Hopkins Press, Baltimore 18, Md.

Distributed in Great Britain by Oxford University Press, London

Printed in the United States of America

Library of Congress Catalog Card Number 62-20557

RESOURCES FOR THE FUTURE, INC.

1775 Massachusetts Avenue, N.W., Washington 6, D. C.

BOARD OF DIRECTORS: Reuben G. Gustavson, Chairman, Horace M. Albright, Erwin D.
Canham, Thomas H. Carroll, E. J. Condon, Joseph L. Fisher, Luther H. Foster,
Hugh L. Keenleyside, Otto H. Liebers, Leslie A. Miller, Frank Pace, Jr., William
S. Paley, Laurance S. Rockefeller, Stanley H. Ruttenberg, John W. Vanderwilt,
P. F. Watzek.

PRESIDENT: Joseph L. Fisher

VICE PRESIDENT: Irving K. Fox

SECRETARY-TRFASURER: John E. Herbert

Resources for the Future is a nonprofit corporation for research and education in
the development, conservation, and use of natural resources. It was established in
1952 with the co-operation of The Ford Foundation and its activities since then have
been financed by grants from that Foundation. Part of the work of Resources for the
Future is carried out by its resident staff, part supported by grants to universities
and other nonprofit organizations. Unless otherwise stated, interpretations and con-
clusions in RFF publications are those of the authors; the organization takes respon-
sibility for the selection of significant subjects for study, the competence of the
researchers, and their freedom of inquiry.

This book is one of RFF's regional studies, which are directed by Harvey S. Perloff.

STAFF EDITORS: Henry Jarrett and Vera W. Dodds.

-iv-