Textbook Collection The textbook collection of the Library includes not only introductory textbooks on economics and law, but also selected classics that have been recommended by lecturers. At least 5 copies of each textbook are available in the Library. Of these two copies are part of the permanent collection (green dots on the spine). These may not be borrowed. One of these copies can be found in its normal subject location, the other is available in the textbook collection on the ground floor. All other copies may be borrowed. The textbook collection is located on the ground floor in stacks 002-007.