These list the workshop participants with their signature and often include a dedication. On this platform we give access only to the oldest four Guest Books. These are the most interesting ones because the newer Guest Books don't contain anything but the signatures of the workshop participants any more.

Although the Guest Books are still maintained today, ODA only includes the first four of them. This is due to the protection of data privacy on the one hand and on the other hand due to the fact that only the first four books contain entries other than signatures.

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