Ctenophora /
Mortensen, Th.
Ctenophora / by Th. Mortensen. - Copenhagen : Bianco Luno, 1912. - 95 p. : ill. ; 32 cm. - The Danish ingolf-expedition ; 5.2 .
Ctenophora / by Th. Mortensen. - Copenhagen : Bianco Luno, 1912. - 95 p. : ill. ; 32 cm. - The Danish ingolf-expedition ; 5.2 .