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Books about Gruisen:
Our World in colour - Wildlife of India [Taschenbuch] by Joanna Van Gruisen by Johanna Van Gruisen, Jonathan Griffin and R Photomedia (1992)
Ladakh. Photographs By Storm. Kenneth R. & Gruisen. Joanna Van by Rao. Nina (1989)
Wiki information Gruisen:
Esther Van Gruisen was the wife of Basil Dean.