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van der Land, J. (1970). Systematics, zoogeography, and ecology of the Priapulida. Zoologische Verhandelingen. 112(1): 1-118. pls. 1-5.
van der Land, J. (1970). Systematics, zoogeography, and ecology of the Priapulida. Zoologische Verhandelingen. 112(1): 1-118. pls. 1-5.