Each of the Contracting States shall admit free of import duties and import taxes the following articles provided they are imported from another Contracting State and that there is no reason to fear abuse:
(a) Documents (folders, pamphlets, books, magazines, guides, posters framed or unframed, unframed photographs and photographic enlargements, maps whether illustrated or not, printed window transparencies) for free distribution, the chief purpose of which is to encourage the public to visit foreign countries, inter alia to attend cultural, touristic, sporting, religious or professional meetings or demonstrations held in such foreign countries, provided these documents do not contain more than 25 per cent private commercial advertising and are obviously designed for general publicity purposes;
(b) Lists and year-books of foreign hotels published or sponsored by official tourist agencies and time-tables of transport services operating abroad, when such documents are for free distribution and do not contain more than 25 per cent private commercial advertising;
(c) Technical material sent to the accredited representatives or correspondents appointed by national official tourist agencies, not intended for distribution, i.e., year-books, telephone directories, lists of hotels, catalogues of fairs, samples of negligible value of handicraft, documentation about museums, universities, spas and similar institutions.