The product is a SPANISH VERSION Metcalf-Eddy textbook titled  Sanitary Engineering Wastewater Treatment, Disposal, and Reuse.

"Ingeniería Sanitaria Tratamiento Evacuación Y Reutilización De Aguas Residuales" by author George Tchobanoglous. Published by McGraw Hill in 1985, this 969-page paperback book is part of the Editorial Labor series. Written in Spanish, this textbook covers the subject areas of water and wastewater, catering to high school, adult education, and vocational school levels. With a vintage feel and illustrated features, this textbook is designed for beginner to advanced learners interested in the field of wastewater reuse. See photos. Very Rare book.