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ArticleNumber of downloads 
Blaauw F.E. (1921) Ornithologische waarnemingen tusschen Buenos-Ayres en Santiago. ARDEA 10 (1) : 1 - 9. 42 [free copy]
Swaen A.E.H. (1921) Bijzonderheden betreffende de Gierzwaluw (Apus apus (L.)). ARDEA 10 (1) : 10 - 24. 35 [free copy]
van Pelt Lechner A.A. (1921) Opgave van eenige ornithologische werken, verschenen tusschen 1 September 1918-31 December 1920. ARDEA 10 (1) : 54 - 56. 23 [free copy]
van Oort E.D. (1923) Ornithologische waarnemingen in Nederland. ARDEA 12 (1) : 1 - 7. 16 [free copy]
Book reviews (2017) Book reviews. ARDEA 105 (2) : 169 - 175. 12 [free copy]
Bijlsma R.G. (2017) Ornithology from the tree tops. Of predation and life. ARDEA 105 (1) : 1 - 3. 12 [free copy]
Swaen A.E.H. (1923) Voyage et avantures de Francois Leguat en Leguatia gigantea Schleg. ARDEA 12 (1) : 25 - 25. 10 [free copy]
Kempenaers B. (2017) Ornithology from the lakeshore. The evolution of advertising. ARDEA 105 (2) : 85 - 87. 9 [free copy]
van Oort E.D. (1921) Het trekken der vogels. ARDEA 10 (2-3) : 75 - 105. 7 [free copy]