Morphological and systematic studies on the cheilostomatous Bryozoa /

by Levinsen, G. M. R (Georg Marius Reinald), 1850-1914
Published 1909

Studies on the Cyclostomata Operculata

by Levinsen, G. M. R (Georg Marius Reinald), 1850-1914
Published 1912

Undersøgelser over bryozoerne i den danske kridtformation,

by Levinsen, G. M. R (Georg Marius Reinald), 1850-1914
Published 1925