Syllabus of Plant Families - A. Engler's Syllabus der Pflanzenfamilien Part 1/2Walter Jaklitsch, Hans-Otto Baral, Robert Lücking, H. Thorsten Lumbsch, Wolfgang Frey · First published 2016Open the Tome
Die Situla in ProvidenceWolfgang Lucke, Otto H. Frey, Karl Olzscha · First published 1962Open the Tome
Wertheim Lectures on Industrial Relations, 1928Beyer Jr., Otto S., Willits, Joseph H., Frey, John P., Leiserson, William M., Commons, John R., Mayo, Elton, Taussig, Frank W.Open the Tome
