Banknote Collectors. Question with some serial numbers on $1 bills?

Your notes are common. The letters in the serial numbers are the letter for the Federal Reserve District the note was issued for. The first district being Boston uses a number 1 or an A. Cleveland Ohio is the 4th district so a 4 or an D, which is the 4th letter of the alphabet.San Francisco is the 12th so an L. You have nothing out of the ordinary. Keep looking for who knows what is still out there. If you want to go through paper money a book on them would help, see a coin dealer for one or a large book store like Borders.