Planktonic StudiesGeorge Wilton Field, Ernst Heinrich Philipp August Haeckel · First published 2018Open the Tome
Monism As Connecting Religion and ScienceErnst Heinrich Philipp August Haeckel · First published 2015Open the Tome
Riddle of the UniverseErnst Heinrich Philipp August Haeckel, Joseph McCabe · First published 1946Open the Tome
Der Kampf um den Entwickelungs-GedankenErnst Heinrich Philipp August Haeckel · First published 1905Open the Tome
The riddle of the universe at the close of the nineteenth centuryErnst Heinrich Philipp August Haeckel · First published 1900Open the Tome
Natürliche SchöpfungsgeschichteErnst Heinrich Philipp August Haeckel · First published 1868 · Latest edition 1879Open the Tome
Die Radiolarien (Rhizopoda radiaria)Ernst Heinrich Philipp August Haeckel · First published 1862Open the Tome
