flatten_gutenberg_id: Subset gutenberg_id from df if necessary
Description
Subset gutenberg_id from df if necessary
Usage
flatten_gutenberg_id(gutenberg_id)
Value
A character vector of gutenberg_ids.
Arguments
- gutenberg_id
A vector of Project Gutenberg IDs, or a data frame
containing a gutenberg_id column, such as from the results of
gutenberg_works().