Circular of information.
| Corporate Author: | |
|---|---|
| Format: | Book | 
| Language: | English | 
| Published: | Quezon City
          National Research Council of the Philippines
    
        1953. | 
| Subjects: | 
| Corporate Author: | |
|---|---|
| Format: | Book | 
| Language: | English | 
| Published: | Quezon City
          National Research Council of the Philippines
    
        1953. | 
| Subjects: |