The following books were found :

worldcat :
* [[Hermann Müller]]: ''Der Dichter und sein Guru : Hermann Hesse, Gusto Gräser, e. Freundschaft'' [[Wetzlar : Lotz, 1979.]], ISBN 3921764017
* Hermann Müller: ''Der Dichter und sein Guru : Hermann Hesse, Gusto Gräser, e. Freundschaft'' Wetzlar : Lotz, 1979., ISBN 3921764017

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ISBN :

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