Helmut Walter
German botanist
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Helmut Roessler
Botanist
Helmut Gams
Austrian botanist
Helmut Fürsch
Entomologist
Helmut Sick
Ornithologist
James Walter Grimes
American botanist
Helmut Amerhauser
Botanist
Walter Jülich
Botanist
Walter Creighton Brown
American herpetologist
Hans-Helmut Poppendieck
Botanist
Helmut Hromadnik
Botanist
Helmut Presser
German botanist
Gerhard Rambold
German mycologist
Charles Walter De Vis
English clergyman, botanist and zoologist
Helmut P. Kimmich
Entomologist
Walter Siehe
Botanist
Walter Tennyson Swingle
American botanist
Walter Watson
Botanist and lichenologist
Robert Walter Schery
Botanist (1917-1987)
Walter Karl Mucher
Austrian botanist
Walter Kittredge
Botanist
Helmut Heider
Thomas Walter (botanist)
American botanist
Walter Karl Johann Roepke
German entomologist
Helmut Baumann
German botanist (1937–2014)
Helmut Ziegelmeier
Walter Medley Tattersall
British marine biologist
Walter Gams
Austrian mycologist
Walter Arndt
German zoologist and physician
Peter-Helmut Ross
Walter R Sweadner
Walter Buller
New Zealand lawyer, naturalist and ornithologist
Walter Knight
Botanist
Frans Hubert Edouard Arthur Walter Robyns
Botanist
Hellmut R. Toelken
Australian Botanist
Walter Baldwin Spencer
English-Australian biologist and anthropologist.
Tobias W. Spanner
Botanist
Helmut Melzer
Botanist
Walter Woelber Dalquest
American zoologist
Helmut Schmalfuss
Herpetologist
John Walter Gregory
British geologist and explorer
Walter Till
Botanist
David Walter Hall
Botanist
Walter Erhardt
German botanist and author
Walter Röösli
Botanist
Helmut Antesberger
Walter Irving
British botanist
Max Walters
English botanist and conscientious objector