Astro-Calendar: 2020 July / 50 Years of Video Calling
Blog-Post: 50th anniversary of commercial video telephone service.
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Link >>> https://spacewatchtower.blogspot.com/2020/07/astro-calendar-2020-july-50-years-of.html

Calendar: Link >>> http://buhlplanetarium4.tripod.com/astrocalendar/2020.html#jul



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