North American Henicocephalidae

by O. A. Johannsen
Published 1909-01-01

Eighth International Congress of Entomology

by O. A. Johannsen
Published 1947-01-01

A Noxious Species of Phlebotomus in the Okefenokee Swamp, Georgia

by O. A. Johannsen
Published 1943-01-01

North American Dixidæ

by O. A. Johannsen
Published 1923-01-01

Recent Entomological Literature

by O. A. Johannsen
Published 1906-01-01

A New Species of Dixa From California

by O. A. Johannsen
Published 1924-01-01

A New Species of Blepharocera From Massachusetts (Diptera)

by O. A. Johannsen
Published 1929-01-01

Sciara Congregata Sp. Nov. (Diptera)

by O. A. Johannsen
Published 1914-01-01

The Life History of Thrypticus Muhlenbergiae Sp. NOV. (Diptera)

by O. A. Johannsen, C. R. Crosby
Published 1913-01-01

Effects of stabilized stannous fluoride dentifrice on dental calculus, dental plaque, gingivitis, halitosis and stain: A systematic review

by A. Johannsen, C.-G. Emilson, G. Johannsen, K. Konradsson, P. Lingström, P. Ramberg
Published 2019-12-01