QR Codes are an advanced version of a barcode which can be used by your smartphone to read web addresses, add contact details to your address book or send SMS messages.
You will need to install a QR Code reader on your smartphone before you can use the codes. Then just take a photograph of the code using the reader and your phone will interpret it as appropriate.
The QR Code above contains the Library's web address.
Find out more about QR Codes on Wikipedia at http://en.wikipedia.org/wiki/QR_Code.
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