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1932. Migration of African birds. Ostrich, vol. 3, pp. 97-109. 



1938. Reviews and records. Ostrich, vol. 9, pp. 105-119. 



1939a. Notes on the eggs of parasitic birds in South Africa. Ostrich, vol. 10, 



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 1939b. Swifts and other birds nesting in buildings. Ostrich, vol. 10, pp. 85-99. 

 1942. Review of Baker's "Cuckoo Problems." Ostrich, vol. 13, pp. 182-183. 

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1957. Birds of South Africa. Cape Town, 504 pp., 56 pis. 

 Roberts, E. L. 



1954. The birds of Malta. Malta, 168 pp. 

 Saunders, Howarb. 



1869. Notes on the ornithology of Italy and Spain. Ibis, ser. 2, vol. 5, 

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 Schiermann, G. 



1926. Beitrag zur Schadigung der Wirtsvogel durch Cuculus canorus. 

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1859. Zweifel am Nichtbriiten des Oxylophns glandarins. Journ. f. Ornith., 

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1949. Factors of evolution. The theory of stabilizing selection. (Transl. by 

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1928. Anmerkungen zum Nehrkorn — Katalog (final part). Beitr. z. Fort- 

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1954. Faune du Congo Beige et du Ruanda Urundi. III. Oiseaux non 

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1903. The birds of South Africa, commenced by Arthur Stark. Vol. 3, 



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 1924. Systema avium Aethiopicarum. Pt. 1, 304 pp. London. 

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1919. A list of the birds of the Anglo-Egyptian Sudan, based on the col- 

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1939. Field observations on some Northern Nigerian birds. Pt. I. Ibis, ser, 



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1940. Field observations on some Northern Nigerian birds. Pt. II. Ibis, 



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