Gottlieb Beratz is the correct name of the author, the spelling 'Bertaz' used by the Library of Congress and amazon.com (since corrected) was is a typographical error.
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Gottlieb Beratz is currently considered a "single author." If one or more works are by a distinct, homonymous authors, go ahead and split the author.
Gottlieb Beratz is composed of 2 names. You can examine and separate out names.