European Road Lighting TechnologiesFederal Highway Administration Staff, Jeff Unick, Dale Wilken, John Arens, Karl Burkett · First published 2001Open the Tome
Wieviel Theologie verträgt die Öffentlichkeit?Karl Gabriel, Edmund Arens, Helmut Hoping · First published 2000Open the Tome
Contribuição para o estudo farmacognóstico da Pluchea suaveolens (Vell.) O. KuntzeKarl Arens, R. J. de Siqueira-Jaccoud, William A. Rodrigues · First published 1958Open the Tome
A excreção cuticular de sais minerais pelas fôlhas de "Ricinus Communis" e seu reflexo sôbre o teor mineral do soloKarl Arens · First published 1946Open the Tome
