Kawah Ijen At Night By Olivier Grunewald

He has also co-authored 14 books:
Escalade Passion by Jean Kouchner and Olivier Grunewald (Editions Atlas,1991, ISBN 2731210435, ISBN 978-2731210439)
Australie terre du rêve, by Olivier Grunewald and Bernadette Gilbertas (Nathan Nature, 1999, ISBN 209261004X, ISBN 978-2092610046)
L'Ouest américain, territoires sauvages by Michel Le Bris and Olivier Grunewald (Le Chêne, 12 May 1999, ISBN 2842771540, ISBN 978-2842771546)