the trick is to offer quality information that answers your niches questions and referring people back to more sources of your material by providing a linkback. give me your sitelink, keywords, anchor text and i upload 7/10 related PDF documents that have your link to the most major document sharing sites that all have PR5 to PR9. for more info or ask your question contact me. P,S: this is not BL from 50 different domain. articles are in English.....
thank u............
