CONTENTS ix 
Problems in the Development and Utilization of Arid Land Plants 
IL, IMIS Jee, 414 
Plants, Animals, and Humans in Arid Areas 
EnrIQUE BELTRAN 419 
Summary Statement 
Oar S. AamMopr 424 
RECOMMENDATIONS BY THE SOCORRO CONFERENCE 427 
CoMMITTEES FOR THE MEETINGS 436 
PARTICIPANTS IN THE SOCORRO CONFERENCE 441 
INDEX 445 
Enp Papers 
The maps of arid homoclimates appearing in the end papers were 
drawn from maps prepared by Peveril Meigs for the UNESCO Arid 
Zone Program. 
