Use this web ical address to access this calendar from your email client: 

 

Right click and copy the link and follow the instructions listed below:

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https://calendar.google.com/calendar/ical/c_1138mjfv3pu1c1n6m4nvg1d6ks%40group.calendar.google.com/public/basic.ics

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Subscribing to an iCal on a Mac

Subscribing to an iCal in Outlook