Step 1 : Introduction to the question "Where is the biggest library in Europe located?"
...The United Kingdom's national library has more cataloged items than any other library in the world. The British Library holds approximately 170 million items from countries around the world. It includes copies of all UK and Ireland publications, but also includes documents published or produced overseas and distributed in the UK. Items are in various formats, including hard copies and digital. The British Library adds about 3 million items every year. It can accommodate 1,200 readers at once. Source: WorldAtlas.com