This is one of the most common "Volume 18" editions. It is a large-format hardcover compilation.
Websites like Tebeosfera provide detailed lists of every edition ever published if you are trying to match a specific cover.
: The stories in this volume focus heavily on 1980s and 90s social satires, such as pollution ( El Bacilón ) and international space tensions ( El cacao espacial ). Version 2: Todo Mortadelo y Filemón Volume 18