Eastern Rhodopes : Nestos, Evros and Dadia, Bulgaria and Greece / [initiative, text and research: Dirk Hilbers, Alex Tabak, Albert Vliegenthart, Herman Dierickx ; additional research: Kim Lotterman, Gino Smeulders, Bouke ten Cate, Anneke Arts ; editing: John Cantelo, Brian Clews, Cees Hilbers, Riet Hilbers, Kim Lotterman, Albert Vliegenthart ; illustrations: Chris Braat, Alex Tabak, Horst Wolter ; maps: Dirk Hilbers, Alex Tabak, Albert Vliegenthart, Horst WolterSpanish Pyrenees and steppes of Huesca - Spain / initiative, text and research: Dirk Hilbers, Kees Woutersen ; additional research, text and information: John Cantelo, Kim Lotterman, Albert Vliegenthart ; editing: John Cantelo, Brian Clews, Jack Folkers, Cees Hilbers, Riet Hilbers, Kim Lotterman, Albert Vliegenthart ; illustrations: Chris Braat ; maps: Dirk Hilbers, Horst Wolter