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  1. By: Clausen, Robert T. (Robert Theodore),
    Type: Article
    In: Torreya
    Volume: 42
    Issue: 6
    Date: 1942
    Page Range: 174--176
    Publication Info: Burlington, Vt, Torrey Botanical Club, 1901-1945
  2. By: Clausen, Robert T. (Robert Theodore),
    Type: Article
    In: Rhodora
    Volume: 51
    Date: 1949
    Page Range: 33--34
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  3. By: Clausen, Robert T. (Robert Theodore),
    Type: Article
    In: Torreya
    Volume: 39
    Issue: 5
    Date: 1939
    Page Range: 125--133
    Publication Info: Burlington, Vt, Torrey Botanical Club, 1901-1945
  4. By: Clausen, Robert T. (Robert Theodore),
    Type: Article
    In: Torreya
    Volume: 45
    Issue: 3
    Date: 1945
    Page Range: 65--67
    Publication Info: Burlington, Vt, Torrey Botanical Club, 1901-1945
  5. By: Clausen, Robert T. (Robert Theodore),
    Type: Article
    In: Memoirs of the Torrey Botanical Club
    Volume: 19
    Issue: 2
    Date: 1938
    Page Range: 1-177
    Publication Info: Durham, N.C, Published for the Club by the Seeman Printery, 1889-
  6. By: Clausen, Robert T. (Robert Theodore),
    Type: Article
    In: Rhodora
    Volume: 49
    Date: 1947
    Page Range: 233--236
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  7. By: Clausen, Robert T. (Robert Theodore),
    Type: Article
    In: Rhodora
    Volume: 39
    Date: 1937
    Page Range: 432--432
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  8. By: Clausen, Robert T. (Robert Theodore),
    Type: Article
    In: Rhodora
    Volume: 39
    Date: 1937
    Page Range: 57--60
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  9. By: Clausen, Robert T. (Robert Theodore),
    Type: Article
    In: Rhodora
    Volume: 39
    Date: 1937
    Page Range: 188--190
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  10. By: Clausen, Robert T. (Robert Theodore),
    Type: Article
    In: Rhodora
    Volume: 46
    Date: 1944
    Page Range: 281--281
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  11. By: Edwards, J L - Clausen, Robert T. (Robert Theodore),
    Type: Article
    In: Torreya
    Volume: 35
    Issue: 1
    Date: 1935
    Page Range: 5--6
    Publication Info: Burlington, Vt, Torrey Botanical Club, 1901-1945
  12. By: Muenscher, W C - Clausen, Robert T. (Robert Theodore),
    Type: Article
    In: Rhodora
    Volume: 36
    Date: 1934
    Page Range: 405--7
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  13. By: Clausen, Robert T. (Robert Theodore),
    Type: Article
    In: Rhodora
    Volume: 41
    Date: 1939
    Page Range: 254--256
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  14. By: Clausen, Robert T. (Robert Theodore),
    Type: Article
    In: Rhodora
    Volume: 43
    Date: 1941
    Page Range: 157--167
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  15. By: Clausen, Robert T. (Robert Theodore),
    Type: Article
    In: American fern journal
    Volume: 38
    Issue: 4
    Date: 1948
    Page Range: 176--176
    Publication Info: [Washington, etc.] American Fern Society
  16. By: Clausen, Robert T. (Robert Theodore), - Wahl, Herbert A
    Type: Article
    In: Rhodora
    Volume: 41
    Date: 1939
    Page Range: 28--34
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  17. By: Clausen, Robert T. (Robert Theodore),
    Type: Article
    In: Rhodora
    Volume: 42
    Date: 1940
    Page Range: 201--202
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  18. By: Clausen, Robert T. (Robert Theodore),
    Type: Article
    In: Rhodora
    Volume: 39
    Date: 1937
    Page Range: 29--31
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  19. By: Clausen, Robert T. (Robert Theodore),
    Type: Article
    In: Rhodora
    Volume: 45
    Date: 1943
    Page Range: 220--221
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  20. By: Clausen, Robert T. (Robert Theodore),
    Type: Article
    In: Rhodora
    Volume: 41
    Date: 1939
    Page Range: 575--584
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  21. By: Clausen, Robert T. (Robert Theodore),
    Type: Article
    In: Rhodora
    Volume: 53
    Date: 1951
    Page Range: 109--111
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  22. By: Clausen, Robert T. (Robert Theodore),
    Type: Article
    In: Torreya
    Volume: 39
    Issue: 1
    Date: 1939
    Page Range: 1--9
    Publication Info: Burlington, Vt, Torrey Botanical Club, 1901-1945
  23. By: Clausen, Robert T. (Robert Theodore),
    Type: Article
    In: Rhodora
    Volume: 38
    Date: 1936
    Page Range: 333--345
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  24. By: Clausen, Robert T. (Robert Theodore),
    Type: Article
    In: Rhodora
    Volume: 54
    Date: 1952
    Page Range: 42--45
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  25. By: Clausen, Robert T. (Robert Theodore), - Uhl, Charles Harrison,
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 7
    Date: 1944
    Page Range: 161--180
    Publication Info: Berkeley, California Botanical Society,
  26. By: Clausen, Robert T. (Robert Theodore),
    Type: Article
    In: Torreya
    Volume: 41
    Issue: 5
    Date: 1941
    Page Range: 161--162
    Publication Info: Burlington, Vt, Torrey Botanical Club, 1901-1945