Allegheny Observatory, Riverview Park, Pittsburgh, Pa., Title from jacket: "Phipps (Allegheny) Observatory, Riverview Park, Pittsburg, Pa., "G 4971" on negative., Detroit Publishing Co. no. 036464., Gift; State Historical Society of Colorado; 1949, Astronomical observatories. , Parks. , United States, Pennsylvania, Pittsburgh.

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Keywords: ., astronomical, observatories., parks., states--pennsylv, united