http://www.sfsidewalkastronomers.org/

http://www.sfsidewalkastronomers.org/

http://www.sfsidewalkastronomers.org/
John Dobson (amateur astronomer)
A Sidewalk Astronomer
Link from a Wikipage to an external page

http://www.sfsidewalkastronomers.org/

http://www.sfsidewalkastronomers.org/