@misc{Peters_C._H._F._Heliographic_1907,
 author={Peters, C. H. F.},
 address={Washington, D. C.},
 howpublished={online},
 year={1907},
 publisher={The Carnegie Institution of Washington},
 language={eng},
 title={Heliographic positions of sun-spots observed at Hamilton College from 1860 t0 1870},
 keywords={sunspots positions, sunspots from 1860 to 1870},
}