Answered By: Gabe Gossett Last Updated: Jan 14, 2016 Views: 49
Most of our ebooks come from a vendor called EBL, but a few, such as this one from National Academies Press, come from other sources. The National Academies Press books are actually open access (free of charge) books. So we are not getting them through a subsciption, which is why they do not provide immediate access. There are a few steps involved in opening the files for free, outlined below.