Julius Theodor Christian Ratzeburg (1801-1871), blatant Prussian entomologist and forest scientist, founder of forestry entomology. Collection of 32 documents awarded to Ratzeburg, diplomas, honorary memberships, letters, etc. between 1825 and 1850. Including a decorative, lithographically designed, Russian document on parchment, a membership of the ''Societas caesarea naturae curiosorum Mosquensis'' donated by Nicholas I of Russia, Certificate of the Naturforschenden Gesellschaft Danzig etc., partly with seals, significant, decorative and well-preserved collection in orig. Paperboard of the time, 60 x 49 cm