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Astronomy
Elements of astronomy: accompanied with numerous illustrations, a colored representation of the solar, stellar, and nebular spectra, and celestial charts of the northern and southern hemisphere
Elements of astronomy: accompanied with numerous illustrations, a colored representation of the solar, stellar, and nebular spectra, and celestial charts of the northern and the southern hemisphere
Primary object lessons for a graduated course of development : a manual for teachers and parents, with lessons for the proper training of the faculties of children and programmes of the grades and steps