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1. Search within (v.1 1980/81)
   Provided by Cornell University
2. Search within (v.4-7 1984-1987)
   Provided by University of Michigan
3. Search within (v.6-9 1986-89)
   Provided by Cornell University
4. Search within (v.8-10 1988-1990)
   Provided by University of Michigan
5. Search within (v.10-13 1990-93)
   Provided by Cornell University
6. Search within (v.11-12 1991-1992)
   Provided by University of Michigan
7. Search within (v.13-14 1993-1994)
   Provided by University of Michigan
8. Search within (v.14-17 1994-97)
   Provided by Cornell University
9. Search within (v.14 1994)
   Provided by University of California
10. Search within (v.15:1 1995)
    Provided by University of California
11. Search within (v.15:3 1995)
    Provided by University of California
12. Search within (v.15-17 1995-1997)
    Provided by University of Michigan
13. Search within (v.16 1996)
    Provided by University of California
14. Search within (v.17 1997)
    Provided by University of California
15. Search within (v.18 1998)
    Provided by University of California
16. Search within (v.18-20 1998-2000)
    Provided by Cornell University
17. Search within (v.18-19 1998-99)
    Provided by University of Michigan
18. Search within (v.19 1999)
    Provided by University of California
19. Search within (v.20-21 2000-01)
    Provided by University of Michigan
20. Search within (v.20 2000)
    Provided by University of California
21. Search within (v.21-23 2001-2003)
    Provided by Cornell University
22. Search within (v.21 2001)
    Provided by University of California
23. Search within (v.22-24 2002-2004)
    Provided by University of Michigan
24. Search within (v.22 2002)
    Provided by University of California
25. Search within (v.23 2003)
    Provided by University of California
26. Search within (v.24-26 2004-2006)
    Provided by Cornell University
27. Search within (v.24 2004)
    Provided by University of California
28. Search within (v.25-26 2005-2006)
    Provided by University of Michigan
29. Search within (v.25 2005)
    Provided by University of California
30. Search within (v.26 2006)
    Provided by University of California
31. Search within (v.27-29 2007-2009)
    Provided by Cornell University
32. Search within (v.27 2007)
    Provided by University of California
33. Search within (v.28 2008)
    Provided by University of California