Not just any old museum app, British Library: Treasures promises to bring the world's largest library to your mobile device. At least, it does if you have an iPhone, iPad or an Android device.According to TechRadar, the app has been developed in conjunction with Toura, makers of mobile guides and will feature items from the Library's Sir John Ritblat Treasures Gallery. Want detail? Well, the library offers up lots of detail.'Treasures will provide a truly multimedia experience including over 100 of the Library's greatest collection items, 250 high-definition images, over 40 videos providing expert commentary, textual interpretation for deeper understanding, as well as up-to-date information about the Library's current exhibitions,' it said.'Through the app users will experience an up close and personal experience with some of the Library's most unique items, such as the first edition of Alice's Adventures in Wonderland, the world's oldest bible Codex Sinaiticus, Nelson's Battle Plan, written before his victory at Trafalgar, Galileo's letters and Leonardo Da Vinci's notebooks.'Expert commentary is provided on many of the items and users can watch, for example, videos of explorer Ben Fogle talking about Scott's Diary and Linguist David Crystal discussing the 1,000 year old poem Beowulf.'Key historical documents include 2000-year-old Oracle Bones from China and an original Magna Carta of 1215. The section devoted to music includes manuscript scores from some of the best-known classical composers, such as Handel, Purcell, Mozart and Schubert, alongside hand-written lyrics by The Beatles.'Sadly, it's not free, but history buffs will probably see the £2.39 price (iPhone and Android) or £3.49 (iPad) as good value. It might even tempt you into the British Library itself to experience it all first-hand.