Ingeborg Frederiksen (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Ingeborg Frederiksen" in English language version.

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books.google.com

Jespersen, Poul (1952). Danske fugle, sjældnere arter. G. E. C. Gad.

dendron.dk

Nielsen, Chr. (1965). "Ingeborg Frederksens Tegninger af "Berømte" Træer" (PDF) (in Danish). Dansk Dendrologisk Årsskrift, Vol 2,2. p. 73. Retrieved 30 June 2021.

dof.dk

pub.dof.dk

Løppenthin, Bernt (1977). "DOFT vol. 71 nr. 1 1977, Personalia: Ingeborg Frederiksen" (in Danish). Dansk Ornitologisk Forenings Tidsskrift. p. 73. Retrieved 30 June 2021.

jstor.org

Löve, Áskell (November 1957). "A New Flora of Greenland". Rhodora. 59 (707). Rhodora, Vol 59: 290–292. JSTOR 23306232. Retrieved 30 June 2021.

kulturarv.dk

Hartmann, Sys (1994). "Ingeborg Frederiksen" (in Danish). Kunstindeks Danmark & Weilbachs Kunstnerlesikon. Retrieved 30 June 2021.