SPAEPEN, J. Migration of the Skylark, Alauda arvensis L. / By J. Spaepen and F. Van Cauteren. -- [S.l.] : [s.n.], [1962?] - p. 275-297 il. Separata de : Le Gerfaut = De Giervalk, Bruxelles, 1962, t.52 Subjects--Topical Terms: Aves - Migración Universal Decimal Class. No.: 598.2-19