Trade barriers to knowledge a manual of regulations affecting educational, scientific and cultural materials.
| 企业作者: | |
|---|---|
| 格式: | 图书 |
| 语言: | English |
| 出版: |
Paris
UNESCO
[1955].
|
| 版: | New and rev. ed. |
| 主题: |
| 企业作者: | |
|---|---|
| 格式: | 图书 |
| 语言: | English |
| 出版: |
Paris
UNESCO
[1955].
|
| 版: | New and rev. ed. |
| 主题: |