Accessibility of a great number of online chemistry journals is subjected to a mixed paying policy: the publisher may grant free access to a selected set of volumes (issues) while the admission to the rest of the database may be open just to subscribers or paying visitors. Quite often the information on the availability status is hidden deeply in the publisher's website pages and this complicates finding the free part of content.We selected the journals based on their free availability to reader, but not on publishers' strategies, which were different (Open Access Initiative, publisher's promotional strategy, government's funding, etc.) for different journals and publishers.
