1 Subjects: “...Astronomical instruments...”

2 Subjects: “...Astronomical instruments...”

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7 Subjects: “...Astronomical geography / Popular works...”

8 Subjects: “...Astronomy...”

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18 Table of Contents: “... -- Astronomers in the Antipodes -- Americans in Batakland -- Interwar Researches -- Postwar American Scholar...”

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20 Table of Contents: “... in medical domain classification -- The Classification of IRAS Point Sources -- Astronomical classification...”