title: "Princeton summary" author: "Leo Lahti / Computational History Group" date: "2018-04-26" output: markdown_document
## Error in filter_impl(.data, quo): Evaluation error: object 'topic' not found.
## Error in grouped_df_impl(data, unname(vars), drop): Column `topic` is unknown
## Error in FUN(X[[i]], ...): object 'topic' not found
## Error in filter_impl(.data, quo): Evaluation error: object 'country' not found.
## Error in filter_impl(.data, quo): Evaluation error: object 'country' not found.
## Error in UseMethod("droplevels"): no applicable method for 'droplevels' applied to an object of class "NULL"
## Error in grouped_df_impl(data, unname(vars), drop): Column `country` is unknown
## Error in FUN(X[[i]], ...): object 'country' not found
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