"E L Keith" is a typo although I have observed "Alexander" spelled "Elexander" on more than one occasion. Via prior postings, I believe your primary interest to be surname Foster? Your analysis of Vitula is correct and supported by 1930 CA-San Bernardino-Ontario-District 46-Image 27. Mary A. Holliday age 59 was enumerated as sister-in-law to E. S.(L) Keith with "Vitulie" as part of the household. Data on your tree indicates you are aware Mary wed John W. Holliday. Add 1900 Indian Territory-Cherokee Nation-Township 20-District 30-Image 7, 1910 Hunt-Precinct 2-District 120-Image 12, and 1940 CA-San Bernardino-Ontario-(36-70)-Image 25 and you'll have Mary's entire census references. On 1900 Indian Territory, she/husband were neighbors of Alexander Keith's family. Recall seeing her mother also in 1900 Cherokee Nation but failed to record notes. Believe her mom's maiden name was McVey? That's part of California Death Record for Rufus Foster and also Mary Holliday (25 Jan 1943).