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Two sheets of photographs of the sun taken with a Dallmeyer photo-heliograph

1870-1875

One of two sheets of photographs of the sun taken with a Dallmeyer photo-heliograph

1871-1875
One of two sheets of photographs of the sun taken with a Dallmeyer photo-heliograph, at Wilna Observatory taken during Setember 1870.

One of two sheets of photographs of the sun taken with a Dallmeyer photo-heliograph

1870