Echinoidea /
Mortensen, Th.
Echinoidea / by Th. Mortensen ; translated by Torben Lundbeck. - Copenhagen : Bianco Luno, 1903-1907. - v. : ill. ; 32 cm. - The Danish ingolf-expedition ; 4.1 ; 4.2 .
Echinoidea / by Th. Mortensen ; translated by Torben Lundbeck. - Copenhagen : Bianco Luno, 1903-1907. - v. : ill. ; 32 cm. - The Danish ingolf-expedition ; 4.1 ; 4.2 .