If you have an iPhone, download the Pages app. You can use it to export a Pages document to Word format on your phone, send it to your email, and then open the document on a library computer in Word.
You can also use iCloud.com to open the file in Pages on the web, then save it or copy/paste the data from Pages in iCloud to Word in Windows.
If iCloud is not available to you, you may have to try a more complicated work-around described on this page: http://osxdaily.com/2014/07/16/open-pages-format-file-in-windows/