Thank you Kathy,
I was skeptical of Eldora Milks marrying Thom. Lawson, because of their diverse births, but then I found a marriage record for them at: Iowa Marriages, 1809-1992 for Thomas J. Lawson, on Family Search. The marriage record named her parents and her place of birth as NY. Then I learned that one of Eldora's older sisters and her family also moved to Iowa. I surmise then that Eldora either went with them or went to Iowa later to live with them. Much of his happened in the census 'dead zone' period of 1880 to 1900.