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I do not have my books at all, but numbers are not at all required. The rules about illegal substitution that added the 9 yard marks could apply to numbers or a line or "tick mark" in order comply with a legal substitution. The numbers are never required on a field. It is just in recent years that I can pretty much expect numbers on the field. Many fields for years only had lines.
Peace
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Let us get into "Good Trouble."
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Charles Michael “Mick” Chambers (1947-2010)
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