Go to your calendar and find the section iCal URL .
Click on the button Copy iCal URL
Open Google Calendar in your favorite browser.
In the section Other calendars in the sidebar, click on the + icon and then choose From URL.
Paste the URL you've just copied and click on Add calendar. You are done.
Open the application Calendar on your Mac.
In the menu File, click on New Calendar Subscription .
Paste the URL you've just copied before and click on Subscribe .
Choose a name for your calendar and you are all set up.
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