Where are errata, amendments and modifications of the Polish Standards available?

Just as the PNs themselves, errata, amendments and modifications of the Polish Standards form a body of documents, and they are available wherever the PN body is available, that is at the PKN’s stationary reading rooms in Warsaw, Katowice, and Łódź. Modifications may be purchased at the online shop, indirectly via the Wiedza website, or at the PKN’s distribution outlets. Amendments and errata may be downloaded free of charge from the online shop. As far as access services are concerned, all modifications, amendments and errata are added automatically to the sets of standards purchased.