Broedvogels van Alkmaar : een onderzoek naar broedvogels van het stedelijk gebied van Alkmaar in 1984 / red.: Kees WoutersenSpanish Pyrenees and steppes of Huesca - Spain / [initiative, text and research: Dirk Hilbers, Kees Woutersen ; additional research, text and information: John Cantelo ... et al. ; ed.: John Cantelo ... et al. ; ill.: Cees Braat ; maps: Dirk Hilbers ... et al.]Canary Islands / Crossbill Guides FoundationCanary Islands / Crossbill Guides FoundationSpanish 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 WolterEastern Andalucía : Córdoba to Cabo de Gata - Spain / initiative, text and research: Albert Vliegenthart, Bouke ten Cate, Dirk Hilbers, Kees Woutersen ; additional research, text and information: John Cantelo, Kim Lotterman, Antoon De Rycke ; editing: John Cantelo, Brian Clews, Cees Hilbers, Riet Hilbers, Kim Lotterman ; illustrations: Horst Wolter ; maps: Alex Tabak