by R. Rieger | .
by L . Zechmeister | .
by G. Haug | H. Hoffmann.
by Johannes Piiper | .
by Miles H. A. Keenleyside | .
by K. Slama | .
by Karl Esser | Rudolf Kuenen.
by Myron C. Ledbetter | Keith R. Porter.
by W. Wiessner | .
by U. Luttge | .
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