Trade barriers to knowledge a manual of regulations affecting educational, scientific and cultural materials.

ग्रंथसूची विवरण
निगमित लेखक: United Nations Educational, Scientific and Cultural Organization. Division of Free Flow of Information
स्वरूप: पुस्तक
भाषा:English
प्रकाशित: Paris UNESCO [1955].
संस्करण:New and rev. ed.
विषय: