Importing vector graphics pdf - works for polygones, not for points?

Hi,

I'm trying to import this pdf here (http://pubs.usgs.gov/tm/2006/11A02/FGDCgeostdTM11A2web_Sec37.pdf into CorelDRAW Technical Suite X6. It works - but only for the polygones. The pdf consists of text, polylines, polygones and points. The points do not appear after the import. In fact, they are there, I can select the nodes, but I can't make them visible?