Heliographic positions of sun-spots : observed at Hamilton College from 1860-1870 /
Peters, C. H. F.(Christian Heinrich Friedrich),1813-1890.
Frost, Edwin Brant,1866-1935.
Washington, D.C. : Carnegie Institution of Washington,
1907.
"List of the principal papers by Dr. C.H.F. Peters dealing with solar observations"--p. 189.
Sunspots.