"Least squares." . . . . . . . . . . . . . . . "A Treatise on practical astronomy, as applied to geodesy and navigation, by C. L. Doolittle" . . . "A treatise on practical astronomy as applied to geodesy and navigation"@en . "A treatise on practical astronomy as applied to geodesy and navigation" . . . . . . . . . . . . . . . "A treatise on practical astronomy, as applied to geodesy and navigation"@en . "A treatise on practical astronomy, as applied to geodesy and navigation" . . . . . . . . . "Practical astronomy"@en . . . . . "A treatise on practical astronomy : as applied to geodesy and navigation"@en . "Interpolation." . . . . "Astronomía esférica Obras anteriores a 1900." . . "Spherical astronomy." . .