You can easily merge the public view of any localendar calendar to a Google Calendar by following these steps:
Step 1: Know Your iCalendar URL
You'll need the URL to your localendar iCalendar feed. The format is:
where <member name> is your localendar login, or the name of the calendar you wish to merge
Most public localendar pages have a small "iCal" icon at the bottom of the page that points to this url. You can use this as a shortcut for getting this link.
Step 2: Add to your Yahoo Calendar
For the most up-to-date directions, please refer to Yahoo's own documentation for this step