Gustav Manz
Museums
The Cleveland Museum owns a gold dragonfly alighting on swirled glass atop a tortoiseshell comb.
The Newark Museum owns a gold vine Manz necklace with a teardrop opal pendant.
A museum in Delaware holding Manz's archive.
Website
A very nice biographical article by Courtney Bowers in Antiques with additional sources listed.
A website with lots of pictures of his works and replicas offered for sale by descendants of Gustav Manz.
A blog with updates about Gustav Manz's works, shows, etc. by descendants of Gustav Manz
An article about Manz in the New York Times' Arts & Antiques section of September 27, 2012.