Ophiuroidea /
Mortensen, Th.
Ophiuroidea / by Th. Mortensen. - Copenhagen : Bianco Luno, 1933. - 121 p. : ill. ; 32 cm. - The Danish ingolf-expedition ; 4.8 .
Ophiuroidea / by Th. Mortensen. - Copenhagen : Bianco Luno, 1933. - 121 p. : ill. ; 32 cm. - The Danish ingolf-expedition ; 4.8 .