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Mortensen, T. (1938). Contributions to the study of the development and larval forms of Echinoderms. IV. Det Kongelige Danske videnskabernes selskabs skrifter. Naturvidenskabelig og mathematisk afdeling. 9, series VII, no. 3: 1-59, 30 figs, 12 pls.
Mortensen, T. (1938). Contributions to the study of the development and larval forms of Echinoderms. IV. Det Kongelige Danske videnskabernes selskabs skrifter. Naturvidenskabelig og mathematisk afdeling. 9, series VII, no. 3: 1-59, 30 figs, 12 pls.
