Each original $39.95. The product is a collection of two programming books by Robert C. Martin, titled "Clean Architecture" and "Clean Agile." These books are part of the Robert C. Martin series and are designed as textbooks for adult education and further education levels. The books cover the subject area of computers and are written in English. Published by Pearson, they are available in a trade paperback format, making them convenient for both reading and reference purposes. For individuals interested in learning about clean architecture and agile development practices, this set of books by Robert Martin offers valuable insights and guidance. No returns.