1) Ad-agency item 2) ATM no 3) Bank IRA 4) Bank no 5) Bank rec 6) Bank statement ID 7) Bank statement no 8) Bankbook ID 9) Bill no 10) Billing no 11) Bookkeeping no 12) Bookkeeping rec 13) Brokerage cust 14) Business school subj 15) Business school subject 16) Busy one in Apr 17) Check no 18) Checkbook no Found on https://www.crosswordclues.com/clue/acct