| check_date_inputs | Helper function for statsgrokse() | 
| check_page_inputs | helperp function for statsgrokse() that checks and corrects... | 
| download_data | function downloading prepared URLs | 
| exapnd_ts | vectorized version of expand_ts() | 
| expand_ts | Helper function for statsgrokse() that transforms a time span... | 
| get_data | function for getting data (download + extraction) | 
| html | function downloading content | 
| http_header | function for pasting together the HTTP user-agent field | 
| prepare_urls | function preparing URLs for downlaod | 
| prev_month_end | function to get date of end of prev month | 
| prev_month_start | function to get date of start of prev month | 
| statsgrokse | Function for getting access statistics for wikipedia pages... | 
| wp_date | Package specific 'as.Date()' function | 
| wp_day | Function to extract the day | 
| wp_month | Function to extract the month | 
| wp_wday | Function to extract the day of the week | 
| wp_year | Function to extract the year | 
| wp_yearmonth | function for getting year and month of a timestamp | 
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