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  1. By: Christensen, Carl,
    Publication info: Hafniae : Apud H. Hagerup (Typis Triers Bogtrykkeri (G.L. Lind & Numa Fraenkel)), 1905-1906
    Holding Institution: Biblioteca Digital del Real Jardín Botánico de Madrid
  2. By: Christensen, Carl,
    Publication info: Hafniae : Apud H. Hagerup (Typis Triers Bogtrykkeri), 1913
    Holding Institution: Biblioteca Digital del Real Jardín Botánico de Madrid
  3. By: Christensen, Carl,
    Publication info: Hafniae [Copenhagen], H. Hagerup, 1906
    Holding Institution: Missouri Botanical Garden, Peter H. Raven Library
  4. By: Christensen, Carl,
    Publication info: København, B. Lunos bogtr, [1912-1919 [i.e. 1913-1920]
    Holding Institution: Multiple institutions
  5. By: Harley, Winifred J., - Christensen, Carl, - Copeland, Edwin Bingham,
    Publication info: [Between 1935 and 1960]
    Holding Institution: Harvard University Botany Libraries
    BHL Collections: BHL Field Notes Project
  6. By: Christensen, Carl,
    Publication info: Honolulu, Hawaii, The Museum, 1925
    Holding Institution: University of Michigan
  1. By: Christensen, Carl, - Tardieu-Blot, (Laure) Mme.,
    Type: Article
    In: Bulletin du Muséum national d'histoire naturelle
    Volume: 6
    Series: 2
    Issue: 1
    Date: 1934-01
    Page Range: 107--109
    Publication Info: Paris, Imprimerie nationale, 1907-1971
  2. By: Christensen, Carl, - Holttum, R. E. (Richard Eric),
    Type: Article
    In: The Gardens' bulletin; Straits Settlements
    Volume: 7
    Series: 3
    Issue: 3
    Date: 1934
    Page Range: 191--316
    Publication Info: Singapore, Botanic Gardens, Singapore, 1913-1941
  3. By: Christensen, Carl,
    Type: Article
    In: Bulletin du Muséum national d'histoire naturelle
    Volume: 6
    Series: 2
    Issue: 1
    Date: 1934-01
    Page Range: 100--106
    Publication Info: Paris, Imprimerie nationale, 1907-1971
  4. By: Christensen, Carl,
    Type: Article
    In: Botanical gazette
    Volume: 56
    Issue: 4
    Date: 1913
    Page Range: 331--338
    Publication Info: Hanover, Ind, [publisher not identified], 1876-1991
  5. By: Tardieu-Blot, (Laure) Mme., - Christensen, Carl,
    Type: Article
    In: Notulae systematicae
    Volume: 6
    Issue: 3
    Date: 1937
    Page Range: 129--134
    Publication Info: Paris J. Dumoulin 1909-1960
  6. By: Christensen, Carl, - Tardieu-Blot, (Laure) Mme.,
    Type: Article
    In: Notulae systematicae
    Volume: 6
    Issue: 3
    Date: 1937
    Page Range: 135--157
    Publication Info: Paris J. Dumoulin 1909-1960
  7. By: Tardieu-Blot, (Laure) Mme., - Christensen, Carl,
    Type: Article
    In: Notulae systematicae
    Volume: 6
    Issue: 4
    Date: 1938
    Page Range: 161--176
    Publication Info: Paris J. Dumoulin 1909-1960
  8. By: Tardieu, L - Christensen, Carl,
    Type: Article
    In: Bulletin du Muséum national d'histoire naturelle
    Volume: 6
    Series: 2
    Issue: 3
    Date: 1934-04
    Page Range: 287--290
    Publication Info: Paris, Imprimerie nationale, 1907-1971
  9. By: Tardieu, L M - Christensen, Carl,
    Type: Article
    In: Bulletin du Muséum national d'histoire naturelle
    Volume: 6
    Series: 2
    Issue: 4
    Date: 1934-06
    Page Range: 383--386
    Publication Info: Paris, Imprimerie nationale, 1907-1971
  10. By: Christensen, Carl, - Tardieu-Blot, (Laure) Mme.,
    Type: Article
    In: Notulae systematicae
    Volume: 8
    Issue: 4
    Date: 1939
    Page Range: 175--210
    Publication Info: Paris J. Dumoulin 1909-1960
  11. By: Christensen, Carl, - Tardieu-Blot, (Laure) Mme.,
    Type: Article
    In: Bulletin du Muséum national d'histoire naturelle
    Volume: 6
    Series: 2
    Issue: 5
    Date: 1934-10
    Page Range: 445--451
    Publication Info: Paris, Imprimerie nationale, 1907-1971
  12. By: Christensen, Carl, - Tardieu-Blot, (Laure) Mme.,
    Type: Article
    In: Notulae systematicae
    Volume: 5
    Issue: 1
    Date: 1935
    Page Range: 2--13
    Publication Info: Paris J. Dumoulin 1909-1960
  13. By: Tardieu-Blot, (Laure) Mme., - Christensen, Carl,
    Type: Article
    In: Notulae systematicae
    Volume: 5
    Issue: 3
    Date: 1936
    Page Range: 165--173
    Publication Info: Paris J. Dumoulin 1909-1960
  14. By: Christensen, Carl, - Tardieu-Blot, (Laure) Mme.,
    Type: Article
    In: Notulae systematicae
    Volume: 5
    Issue: 4
    Date: 1936
    Page Range: 260--267
    Publication Info: Paris J. Dumoulin 1909-1960
  15. By: Tardieu-Blot, (Laure) Mme., - Christensen, Carl,
    Type: Article
    In: Notulae systematicae
    Volume: 6
    Issue: 1
    Date: 1937
    Page Range: 1--11
    Publication Info: Paris J. Dumoulin 1909-1960
  16. By: Tardieu-Blot, (Laure) Mme., - Christensen, Carl,
    Type: Article
    In: Notulae systematicae
    Volume: 7
    Issue: 1
    Date: 1938
    Page Range: 10--15
    Publication Info: Paris J. Dumoulin 1909-1960
  17. By: Tardieu-Blot, (Laure) Mme., - Christensen, Carl,
    Type: Article
    In: Notulae systematicae
    Volume: 7
    Issue: 2
    Date: 1938
    Page Range: 65--104
    Publication Info: Paris J. Dumoulin 1909-1960
  18. By: Harley, Winifred J., - Christensen, Carl, - Copeland, Edwin Bingham,
    Type: List
    In: Plant lists : Liberia
    Date: 1935-1960
    Publication Info: [Between 1935 and 1960]
  19. By: Christensen, Carl,
    Type: Article
    In: American fern journal
    Volume: 7
    Date: 1917
    Page Range: 33--35
    Publication Info: [Washington, etc.] American Fern Society
  20. By: Christensen, Carl,
    Type: Article
    In: ZooKeys
    Volume: 678
    Date: 2017
    Page Range: 155-156
    Publication Info: Pensoft Publishers 2017
  21. By: Christensen, Carl,
    Type: Article
    In: The Gardens' bulletin; Straits Settlements
    Volume: 4
    Series: 3
    Issue: 5
    Date: 1929
    Page Range: 375--407
    Publication Info: Singapore, Botanic Gardens, Singapore, 1913-1941
  22. By: Christensen, Carl,
    Type: Article
    In: American fern journal
    Volume: 1
    Date: 1911
    Page Range: 33--37
    Publication Info: [Washington, etc.] American Fern Society
  23. By: Christensen, Carl,
    Type: Article
    In: American fern journal
    Volume: 3
    Date: 1913
    Page Range: 1--4
    Publication Info: [Washington, etc.] American Fern Society
  24. By: Christensen, Carl,
    Type: Article
    In: American fern journal
    Volume: 1
    Date: 1911
    Page Range: 65--70
    Publication Info: [Washington, etc.] American Fern Society
  25. By: Christensen, Carl,
    Type: Article
    In: Det Kongelige Danske videnskabernes selskabs skrifter
    Volume: ser. 7, b. 4 (1907-1908)
    Series: 7
    Date: 1907-1908
    Page Range: 247-336
    Publication Info: København,
  26. By: Christensen, Carl,
    Type: Article
    In: American fern journal
    Volume: 1
    Date: 1911
    Page Range: 93--97
    Publication Info: [Washington, etc.] American Fern Society