is_first_edition | R Documentation |
Identify potential first editions
is_first_edition(df)
df |
data.frame with the fields: author, title, publication_year |
Identifies unique title-author combinations and marks the earliest occurrence as first edition.
Logical vector indicating the potential first editions
Leo Lahti leo.lahti@iki.fi
See citation("bibliographica")
## Not run: fed <- is_first_edition(df)
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