John R. Percy

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Understanding Variable StarsJohn R. Percy
Understanding Variable Stars
John R. Percy · 2007 · 372 pages
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Teaching and learning astronomyJay M. Pasachoff, John R. Percy
Teaching and learning astronomy
Jay M. Pasachoff, John R. Percy · 2005 · 268 pages
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The Study of Variable Stars Using Small TelescopesJohn R. Percy
The Study of Variable Stars Using Small Telescopes
John R. Percy · 1986 · 265 pages
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