www.gutenberg.org/ebooks/subject/12294

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ebooks/10349 (http) Naar het middelpunt der Aarde by Jules ... 9 1
ebooks/18857 (http) A Journey to the Centre of the Earth by ... 14 1
ebooks/3748 (http) A Journey into the Interior of the Earth ... 9 1
ebooks/4791 (http) Voyage au Centre de la Terre by Jules ... 10 1