The New Encyclopedia Britannica.
| Format: | Book | 
|---|---|
| Language: | English | 
| Published: | 
        Chicago
          Encyclopaedia Britannica
    
        c1990.
     | 
| Edition: | 15th ed. | 
| Subjects: | 
| Format: | Book | 
|---|---|
| Language: | English | 
| Published: | 
        Chicago
          Encyclopaedia Britannica
    
        c1990.
     | 
| Edition: | 15th ed. | 
| Subjects: |