Arabia petraea /

At head of title: Kaiserliche Akademie der Wissenschaften.

Testing farm seeds in home and school /

"Issued March 1942."

Distinguishing the species of Brassica by their seed /

Contribution from Bureau of Plant Industry, Soils, and Agricultural Engineering.

Beitrag zur Beurteilung der Lehren Machs.

Thesis (doctoral)--Friedrich-Wilhelms-Universitat zu Berlin.