Gerhardt, C.; Gerhardt, Karl; Gerhardt, Karl Adolf Jakob; Gerhardt, Karl Adf. Cstn. Jacob; Gerhardt, Carl Christian Adolf; Gerhardt, Carl Christian Adolph Jacob; Gerhardt, Karl Adolf Christian Jakob; Gerhardt, Carl Jakob Christian Adolph; Gerhardt, Carl Adolf Christian Jakob; Gerhardt, Karl Jakob Christian Adolph; Gerhardt, Karl Adolf Jakob Christian; Gerhardt, Carl Adolf Jakob Christian