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Venus and Mercury, and How to Observe Them
  • PDF
  • English
  • Year: 2008
  • Author: Peter Grego (auth.)
Astronomical Cybersketching: Observational Drawing with PDAs and Tablet PCs
  • PDF
  • English
  • Year: 2009
  • Author: Peter Grego (auth.)
Mars and how to observe it
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  • English
  • Year: 2012
  • Author: Peter Grego (auth.)
Astronomical Cybersketching: Observational Drawing with PDAs and Tablet PCs
  • PDF
  • English
  • Year: 2009
  • Author: Peter Grego (auth.)
Astronomical Cybersketching: Observational Drawing with PDAs and Tablet PCs
  • PDF
  • English
  • Year: 2009
  • Author: Peter Grego (auth.)
Galileo and 400 Years of Telescopic Astronomy
  • PDF
  • English
  • Year: 2010
  • Author: Peter Grego, David Mannion (auth.)
Astronomical Cybersketching. Observational Drawing with PDAs and Tablet PCs
  • PDF
  • English
  • Year: 2009
  • Author: Peter Grego
The Moon and How to Observe It (Astronomers' Observing Guides)
  • PDF
  • English
  • Year: 2005
  • Author: Peter Grego
The Moon and How to Observe It (Astronomers' Observing Guides)
  • PDF
  • English
  • Year: 2005
  • Author: Peter Grego
Venus and Mercury, and How to Observe Them (Astronomers' Observing Guides)
  • PDF
  • English
  • Year: 2008
  • Author: Peter Grego
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