International Association of Machinists and Aerospace Workers (IAMAW) Local Lodge 174 (Washington, D.C.), "Columbia Lodge," is one of the oldest Machinists' lodges in North America. IAMAW Local Lodge 174 (Washington, D.C.) records consists of photographs, pins, financial ledgers and documents from the early portion of the lodge's history.

The collection consists of ledger books (including minutes, cash books, membership rolls and dues) that document the business activity of the Machinists' Local Lodge 846 for the years 1913-1956.