Trade barriers to knowledge a manual of regulations affecting educational, scientific and cultural materials.
| निगमित लेखक: | |
|---|---|
| स्वरूप: | पुस्तक |
| भाषा: | English |
| प्रकाशित: |
Paris
UNESCO
[1955].
|
| संस्करण: | New and rev. ed. |
| विषय: |