Why is the size of the B's for the BB* prefixes other than BBP and BBX not listed? I have a BBH that is large B, small B not I do not see this listed. Is this because all BBH's are this way?
I see there are distinctions between Thiessen-Crow BGA-BGZ for one small B, one large B and two small B's. Is this for the first and last letters being B, or is this listing in Charlton refering to cases like this BBH prefix?