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Vervoort, W. (1972a). Hydroids from the Theta, Vema and Yelcho cruises of the Lamont-Doherty geological observatory. Zoologische Verhandelingen, Leiden. 120: 1-247.
Vervoort, W. (1972a). Hydroids from the Theta, Vema and Yelcho cruises of the Lamont-Doherty geological observatory. Zoologische Verhandelingen, Leiden. 120: 1-247.