Included in the collection are balance statements, checkbooks and cancelled checks, interbanking transactions, ledgers and journals, minutes of directors' meetings, receipts, reports, stock records, tax returns, and records of the bank's activity with the Joseph Lawrence Free Public Hospital. Only a small portion of the material pertains directly to the whaling industry.

Included in the collection are miscellaneous correspondence, bills, receipts, bank drafts, and stock certificates, together with insurance policies on the ship HALCYON. Included is a bank book, "New London Bank in Account with Coddington Billings, Treasurer of Union Insurance Co., New London, 1828-1837." Persons represented include company treasurer Coddington Billings.