prepared by the Board of Engineers for Rivers and Harbors War Department and the Bureau of Operations United States Shipping Board. Prepared by The Board of Engineers for Rivers and Harbors War Department, in cooperation with the Bureau of Operations United States Shipping Board. prepared by the Board of Engineers for Rivers and Harbors War Department and Division of Research United States Maritime Commission. The Board of Engineers for Rivers and Harbors War Department and United States Shipping Board. prepared by the Board of Engineers for Rivers and Harbors War Department.