The AGS listing shows about 100 COX names. But I did find a Lula COX in the 1901 census at lethbridge. She is listed as wife born 1875 in USA age 25. Also listed in the 1901 lethbridge census is Joseph L COX houeshold head born 1872 USA age 29.
This 1901 Alberta census was indexed by members of the Edmonton Branch of the Alberta Genealogical society. If you need more information about this census you may wish to contact a reseacher at: email@example.com