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• Orobanchaceae

• Euphrasia

• Monographie der Gattung Euphrasia. Mit einem De Candolle'schen Preise ausgezeichnete Arbeit. (W. Engelmann, 1896), by Richard Wettstein and Deutsche Gesellschaft der Wissenschaften und Künste für die Tschechoslowakische Republik (Prague) (page images at HathiTrust)
• Euphrasia officinalis et espèces voisines : Erica vagans et multiflora. (V. Hissette, 1835), by H.-F. Soyer-Willemet (page images at HathiTrust)

Items below (if any) are from related and broader terms.

• The genus Eupẖṟasia in North America (Gray Herbarium of Harvard University, 1915), by Merritt Lyndon Fernald, K. M. Wiegand, and Karl M. Wiegand (page images at HathiTrust)
• Monographie der Gattung Orobanche (T. Fischer, 1890), by G. Beck-Mannagetta (page images at HathiTrust)
• The morphological continuity of Scrophulariaceae and Orobanchaceae (Philadelphia, 1920), by Irwin Boeshore (page images at HathiTrust)

• Beiträge zur anatomie der Vegetations Organe von Lathraea squamaria,L. (Breslau, 1879), by Hermann Krause (page images at HathiTrust)

• Recherches sur l'appareil végétatif des Bignoniacées, Rhinanthacées, Orobanchées et Utriculariées ... (G. Masson, 1888), by Maurice Hovelacque (page images at HathiTrust)
• Recherches sur l'appareil végétatif des bignoniacées, rhinanthacées, orobanchées et utriculariées. (G. Masson, 1888), by Maurice Hovelacque (page images at HathiTrust)
• Ragionamento sopra i mezzi piu ̀necessarj per far rifiorire l'agricoltura (Nella stamperia di G. Albizzini, 1752), by Ubaldo Montelatici and Pier Antonio Micheli (page images at HathiTrust)
• Die Entwicklungsgeschichte der Orobanchen, mit besonderer Berücksichtigung ihrer Beziehungen zu den Kulturpflanzen. (C. Winter's Universitätsbuchhandlung, 1887), by Ludwig Konrad Albert Koch (page images at HathiTrust)
• Metodo sicuro per distruggere i succiameli con alcune reflessioni d'agricoltura. (Stecchi e Pagani, 1767), by Giovanni Lapi (page images at HathiTrust)
• The broom-rapes (Kentucky Agricultural Experiment Station of the State College of Kentucky, 1903), by H. Garman (page images at HathiTrust)
• Monographie des Orobanches. (Genève., 1827), by Jean-Pierre Vaucher (page images at HathiTrust)

• Iakttagelser öfver tillväxten hos Orobanche-Arter (Lund, 1895), by B. Jönsson (page images at HathiTrust)

• The broom-rape of hemp and tobacco (Kentucky Agricultural Experiment Station of the State College of Kentucky, 1890), by H. Garman (page images at HathiTrust)