Haas' specialty involved the study of land and freshwater snails, as well as research of the family Unionidae (freshwater mussels).
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He performed extensive field investigations in Norway (1910), Pyrenees, Spain, France (1914–19), southern Africa (1931–32; as part of the Hans Schomburgk expedition) and the Americas (Brazil, Bermuda, Cuba, Canada).
Fritz Lang | Fritz Leiber | Fritz Kreisler | Rohm and Haas | Fritz Weaver | Fritz Reiner | Fritz Haber | Charlie Haas | Robert Fritz | Robert C. Fritz | Haas School of Business | Fritz Gesztesy | Fritz Dreisbach | Chris Fritz | Tommy Haas | L'amico Fritz | Fritz London | Fritz Laves | Fritz Kranefuss | Fritz Grünbaum | Dennis Fritz | Russ Haas | Fritz von Opel | Fritz | Richard Haas | Newman/Haas Racing | Lukas Haas | Haas Automation | Fritz Wunderlich | Fritz Walter |