Hello all and thanks in advance for any help or direction.  I have
co-authorship data that looks like:


Paper    Author                      Year
1       SmithKK  JonesSD       2008
2       WallaceAR  DarwinCA  1999
3       HawkingS                    2003


I would like:
Paper      Author              Year
1         SmithKK               2008
1         JonesSD               2008
2         WallaceAR           1999
2          DarwinCA            1999
3          HawkingS            2003



Thanks for your patience with what is likely an easy question
 <r-help@r-project.org>

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