Technological trends and national policy including the social implications of the new inventions.
| निगमित लेखक: | |
|---|---|
| स्वरूप: | पुस्तक | 
| भाषा: | English | 
| प्रकाशित: | Washington
          United States Government Printing Office
    
        c1937. | 
| विषय: |