http://book.klll.cc/ebooks/author/57558.opds?sort_order=title
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Books by Hobrecker, Karl
Free eBooks since 1971.
Project Gutenberg
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https://de.wikipedia.org/wiki/Karl_Hobrecker
See also: de.wikipedia
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https://book.klll.cc/ebooks/74564.opds
Otto Speckter (German)