The Springer Nature Group carries nearly 10,000 available titles dedicated to class instruction. Explore product offerings using the Springer catalog, which features a search by subject function. To further examine a textbook, Springer provides complimentary samples to instructors. Most Springer samples are provided in a digital format, usually PDF, and include a time limitation. Once a textbook has been chosen, requests to receive a free desk copy are evaluated on an individual basis by Springer. These desk copies, once approved, also feature a 180-day time limit. The request feature is called "Digital Comps" on the Springer website.