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Thanks a lot, Dr.Pete

I had a look on open site explorer, and you're right more links would help a lot, the juice pointing at the page is fairly diluted, facebook and twitter would both be nofollow links as are some of the external links pointing at it. The internal links aren't really well placed for promoting it either, you have a link from : http://gyumolcstarhely.hu/tudasbazis/ but that's a page with an enormous number of links on it, so any credit passed down to it would be minimal. The other internal links seem to place it at the bottom of the page under "ezen" which doesn't really give it a huge advantage in indicating what the page is about (I doubt it's a factor here). If you were to get some external links to point directly at it (or maybe just from the front page of your site), I'm sure it would start appearing. Edit: Just spotted something else, there is a severe drop in pagerank from the front page of the site to that page mentioned above, which does make me wonder if there is a problem with it. Is the page you're asking about new? Have you tried posting any other new pages on there? How are they ranking?

Hi, everyone: problem solved. Here is what I did: I created a seperate sitemap-xml and linked to all the new pdfs. I updated the general sitemap.xml and linked to the new sitemap as well. I (re)submitted both sitempas via the Webmaster Tools. Within a few hours, most of pdfs got indexed and the overall quality of search has improved dramatically. Thanks for all your help.