I didn't find any definitive info for Myrtle Ruth but here's what I found.
Kleppers From oregon Family Tree, trees.ancestry.com/tree/17880343/person/570124171.
Ruth Klepper, b. abt. 1910 OR and in 1930 lived in Jefferson, Marion Co., OR but no more than that.
In 1910 the Klepper family lived in Astoria, Clatsop, OR. William Klepper, b. TN, 39, married 13 yrs, foreman sawmill. Cora, b. OR, 28, had given birth to five children but only four alive in 1910. Harold, b. OR, 11. Earl, b. OR, 9. Ruby, b. OR, 6. Ruth, b. OR, 1/12th.
In 1930 a Ruth Klepper was living with the Van Winkle family in Jefferson, Marion, OR. Ruth klepper, b. OR, 20, single, servant housework.
I also found a Myrtle Goldman and family in 1940 in Modesto, Stanislaus, CA. Ray Goldman, b. AR, 29, educ=7th grade, farm laborer. Myrtle, wife, b. KS, 24, educ=High School 1 yr. Donald Ray, b. AR, 5. Darlene, b. CA, 2. Bobbie Lee (son), b. CA, 2/12ths. In 1935 Ray, Mrytle and Donald were living in Los Angeles.
Do you have a copy of Myrtle and Harold's marriage license? I think I'd order a copy in hopes there is more information on it. You can contact the Oregon State Archives, arcweb.sos.state.or.us/pages/records/aids/vital.html. They have marriage licenses 1852-1945. Successful Searching!