Gottfried Christoph
Beireis

Julius-Universität Helmstedt (Chemistry Tree)


Lorenz Friedrich
von Crell

Julius-Universität Helmstedt (Chemistry Tree)


Karl Wilhelm
Nose

Bonn (Chemistry Tree)


Johann Jacob
Nöggerath

Universität Bonn

Ferdinand
Zirkel

Universität Leipzig
(Options)


Gustaaf Adolf Frederik
Molengraaff

Delft University of Technology


Albrecht
Penck

Universität Wien (Chemistry Tree)

Norbert
Krebs

University of Vienna (GeograTree)


Eduard
Brückner

Universität Wien (Physics Tree)

Charles W.
Cross

U.S. Geological Survey

Thomas Leonard
Walker

University of Toronto (Chemistry Tree)

William Lester
Brown

University of Manchester (Chemistry Tree)

Theodor Heinrich
Behrens

Polytechnical School in Delft


Ian
Campbell

California Division of Mines and Geology

Arthur
Montgomery

Lafayette College

Caleb Wroe
Wolfe

Boston University

Ferdinand ZirkelX