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Title: Photograph of a vertical circle by Ertel at the Pulkovo Obse [Go to resource]
Description: Photograph of a vertical circle by Ertel at the Pulkovo Observatory, St Petersburg in Russia, 1876. License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Subjects: black-and-white prints (photographs)
universal circles
astronomical instrumentsTemporal: 1876 Source: Science Museum Creator: Pulkovo Observatory Identifier: 1876-674 Go to resource More Like this...
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