Stebbins, G.L.; Jenkins, J.A. 1939. Aposporic development in the North American species of Crepis. Genetica. 21(3-4): 191-224.

Stebbins, G.L.; Jenkins, J.A. 1939. Aposporic development in the North American species of Crepis. Genetica. 21(3-4): 191-224.

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