Hi R users,

What is the command  for adding (or how do we add) country boundaries on 
r-spatial plots. 

Thanks  

ZABLONE OWITI
 GRADUATE STUDENT
Nanjing University of Information, Science and Technology
College of International Education
Add: 219 Ning Liu Rd, Nanjing, Jiangsu, 21004, P.R. China

Website: www.nuist.edu.cn
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