The collection reflects the lives and activities of the Avellanals, a prominent pioneering Ybor City family, with the bulk of the collection documenting the life and career of Lt. General José Luis Avellanal y Jimenez. Among the papers in the collection are pamphlets, diaries, ledgers, correspondence, invoices and receipts, contracts, real estate title abstracts, lawsuits (including testimonies), certificates, photographs, corporate minutes, audits, medical reports, patents, stock certificates, newspaper clippings, and a small number of artifacts.