Grace Isabel Colbron and Auguste Groner

Life: A. Groner: 1850-1929

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The Case of the Golden Bullet, [en]

The Case of the Pool of Blood in the Pastor's Study, [en]

The Case of the Registered Letter
A Joe Muller Detective Story, [en]

The Lamp That Went Out, [en]

The Pocket Diary Found in the Snow
A Joe Muller Detective Story, [en]

The Third Sex
(Das dritte Geschlecht), [en] 1914

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