Inside Out Library · ExploreOrbit of the spectroscopic binary [Alpha] Trianguli [microform] (1915)Harper, W. E. (William Edmund), 1878-1940, Dominion Observatory (Canada) · Ottawa : Govt. Print. Bureau · leaf 38Stars · ÉtoilesInternet Archive · Canadiana.org · Public domain (published before 1931). Free to use for anything.More pictures from Orbit of the spectroscopic binary [Alpha] Trianguli [microform]More like this
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