Published in Journal für Ornithologie, in 1904, in volume 52, pages 506-547
Published in Journal für Ornithologie, in 1904, in volume 52, pages 296-301
Published in Journal für Ornithologie, in 1904, in volume 52, pages 316-319
Published in Journal für Ornithologie, in 1904, in volume 52, pages 315-316
Published in Journal für Ornithologie, in 1904, in volume 52, pages 306-308
Published in Journal für Ornithologie, in 1904, in volume 52, pages 302-306
Published in Journal für Ornithologie, in 1904, in volume 52, pages 308-313
Published in Journal für Ornithologie, in 1904, in volume 52, pages 137-244
Published in Journal für Ornithologie, in 1904, in volume 52, pages 313-314
Published in Journal für Ornithologie, in 1904, in volume 52, pages 321-405
Published in Journal für Ornithologie, in 1904, in volume 52, pages 405-410
Published in Journal für Ornithologie, in 1904, in volume 52, pages 455-456
Published in Journal für Ornithologie, in 1904, in volume 52, pages 431-443
Published in Journal für Ornithologie, in 1904, in volume 52, pages 70-80
Published in Journal für Ornithologie, in 1904, in volume 52, pages 122-125
Published in Journal für Ornithologie, in 1904, in volume 52, pages 135-136
Published in Journal für Ornithologie, in 1904, in volume 52, pages 132-135
Published in Journal für Ornithologie, in 1904, in volume 52, pages 80-121
Published in Journal für Ornithologie, in 1904, in volume 52, pages 50-69
Published in Journal für Ornithologie, in 1904, in volume 52, pages 570-572
Published in Journal für Ornithologie, in 1904, in volume 52, pages 555-563
Published in Journal für Ornithologie, in 1904, in volume 52, pages 457-506
Published in Journal für Ornithologie, in 1904, in volume 52, pages 566-570
Published in Journal für Ornithologie, in 1904, in volume 52, pages 563-564