[R-390] new version of "Pearls"

[Collin]

W. Li,
Thank you for keeping this extremely valuable document updated. 
Thank You, Collin

> On May 7, 2016, at 12:48 AM, wli via R-390 <r-390 at mailman.qth.net> wrote:
> 
> The spring 2016 version is up at www.r-390a.net/ under References/Tutorials 
> 
> W. Li
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