Try "theshipslist.com" - all details of ships as well as passenger lists, crews etc. The "old" Mauretania was built in 1907, trooping from 1914-1919, scrapped 1935. Permanent crew (officers, apprentices, doctors), would be employed by the company, Cunard. Aquitania was a sister ship - Cunarders mostly had names ending in "ania" - kept these names even after the merger with White Star. Hope this helps.