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                    Leonardo da Vinci                
                                    
                        (1452 - 1519)                    
                                
             
         
    
   
  
    
    
        
                
            
 
            
                
                    Aldo Leopold                
                                    
                        (1887 - 1948)                    
                                
             
         
    
   
  
    
    
        
                
            
 
            
                
                    Jack London                
                                    
                        (1876 - 1916)                    
                                
             
         
    
   
  
    
    
        
                
            
 
            
                
                    Lucretius                
                                    
                        (c. 95 BC - c. 50 BC)                    
                                
             
         
    
   
  
    
    
        
                
            
 
            
                
                    Thomas Malthus                
                                    
                        (1766 - 1834)                    
                                
             
         
    
   
  
    
    
        
                
            
 
            
                
                    John Mandeville                
                                    
                        (c. 1300 - 1371)                    
                                
             
         
    
   
  
    
    
        
                
            
 
            
                
                    George Perkins Marsh                
                                    
                        (1801 - 1882)                    
                                
             
         
    
   
  
  
  
    
    
        
                
            
 
            
                
                    Herman Melville                
                                    
                        (1819 - 1891)                    
                                
             
         
    
   
  
    
    
        
                
            
 
            
                
                    John Milton                
                                    
                        (1608 - 1674)                    
                                
             
         
    
   
  
    
    
        
                
            
 
            
                
                    Giovanni Pico Della Mirandola                
                                    
                        (1463 - 1494)                    
                                
             
         
    
   
  
    
    
        
                
            
 
            
                
                    Michel de Montaigne                
                                    
                        (1533 - 1592)                    
                                
             
         
    
   
  
  
    
    
        
                
            
 
            
                
                    Isaac Newton                
                                    
                        (1643 - 1727)                    
                                
             
         
    
   
  
    
    
        
                
            
 
            
                
                    Friedrich Nietzsche                
                                    
                        (1844 - 1900)                    
                                
             
         
    
   
  
  
    
    
        
                
            
 
            
                
                    Frederick Law Olmsted                
                                    
                        (1822 - 1903)                    
                                
             
         
    
   
  
  
  
    
    
        
                
            
 
            
                
                    Pliny the Elder                
                                    
                        (23 - 79)                    
                                
             
         
    
   
  
    
    
        
                
            
 
            
                
                    Pliny the Younger                
                                    
                        (61 - 112)                    
                                
             
         
    
   
  
  
    
    
        
                
            
 
            
                
                    Alexander Pope                
                                    
                        (1688 - 1744)