The document discusses the challenges of building an e-only library for researchers at IST Austria. It describes how the library has transitioned to primarily electronic resources over time, growing its e-journal collection from 500 titles in 2010 to over 5,800 in 2014. However, building a completely e-only library faces obstacles, as some important books are not available in digital formats, and researchers still appreciate printed materials for certain tasks. The document concludes that a hybrid model is necessary to meet all user needs.