The collection includes customer account, invoice, and workman's hours ledgers from the Reed Island Iron Company. Records dates from 1880-1896, during most of the known active period of the company (c.1880-c.1906).

Series I: Customer Account and Invoice Ledgers consists of ledgers dating from 1880 through 1893. The majority records are customer accounts (eight of nine ledgers in this series) and include names and transactions, as well as amounts due and paid. The remaining book is a list of customer invoices. There is some overlap among the ledgers and they do not cover all months for the 13 year period.

Series II: Workman's Hours Ledgers contains small booklets from 1886-1896. These ledger include lists of the names of workers for a given month, tracking their hours. There is no apparent overlap between the ledgers and they do not cover the entire time period between August 1886 and April 1896.