Wagner, Moritz. 1875. Der Naturproceß der Artbildung. Das Ausland, 31 May 1875, pp. 425–8; 7 June 1875, pp. 449–52; 14 June 1875, pp. 473–5; 21 June 1875, pp. 490–3; 28 June 1875, pp. 513–16; 19 July 1875, pp. 570–5; 26 July 1875, pp. 589–93.
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