Svenson, H.K. 1944: The New World species of Azolla. American Fern Journal 34: 69–84.
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Reference Properties
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| Svenson, H.K. 1944: The New World species of Azolla. American Fern Journal 34: 69–84. |
| Svenson, H.K. 1944: The New World species of Azolla. American Fern Journal 34: 69–84. |