David Dunlap Observatory Logbook, April 1989-October 1989 Book Discussion

David Dunlap Observatory Logbook, April 1989-October 1989 (63, April 1989-October 1989, Plate Nos. 50541-50687)

David Dunlap Observatory Logbook, April 1989-October 1989 (63, April 1989-October 1989, Plate Nos. 50541-50687)
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David Dunlap Observatory

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