September 1, 1958 (First time it is made clear that Snoopy is Charlie Brown's dog)
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September 2, 1958
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September 3, 1958
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September 4, 1958
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September 5, 1958
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September 6, 1958
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September 7, 1958 (This strip is adapted in Play It Again, Charlie Brown and A Charlie Brown Celebration)
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September 8, 1958
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September 9, 1958
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September 10, 1958
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September 11, 1958
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September 12, 1958
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September 13, 1958
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September 14, 1958
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September 15, 1958 (This strip is adapted in I Want a Dog for Christmas, Charlie Brown)
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September 16, 1958
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September 17, 1958 (This strip is adapted in A Charlie Brown Christmas)
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September 18, 1958
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September 19, 1958 (This strip is adapted in Race for Your Life, Charlie Brown)
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September 20, 1958 (This strip is adapted in It Was a Short Summer, Charlie Brown)
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September 21, 1958 (Football gag for 1958, first time Charlie Brown yells, "Aaugh!" when Lucy pulls the football away)
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September 22, 1958
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September 23, 1958
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September 24, 1958
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September 25, 1958
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September 26, 1958
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September 27, 1958
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September 28, 1958
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September 29, 1958
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September 30, 1958
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← August 1958 October 1958 →
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