I have some additional information for you regarding Fred NELSON.
Extract: Portland City Directories [Oregon], published by R. L. Polk Co.: 1917NELSON, Fred (Martha), h 389 3rd. 1920NELSON, Fred (Martha), ironwkr, h A 389 6th. 1921NELSON, Fred (Martha), carp, h 590 Madison. [Research Note: same information for 1923.] 1924NELSON, Fred (Martha), ironwkr, h 592 Madison. [Research Note: same information for 1926, 1927, 1928, 1931.] 1925NELSON, Fred (Martha), bridgmn, h 592 Madison. 1929NELSON, Fred (Martha), millwkr, h 592 Madison. [Research Note: same information for 1930.] 1933NELSON, Fred (Martha), lab, h 592 Madison. [Research Note: Prior to 1920, the city directories of 1915 and 1918 had several men named Fred Nelson, but none listed with wife Martha.]
Microfilm at the Genealogical Forum of Oregon library, Portland, Oregon: Multnomah County Voter Registration, Foreign Registration Cards, prior to 1967. R979.549 W445 #22741. Extract: Date of Card: Apr. 1, 1930: NELSON, Fred, Pct 51, 592 Madison St., Republican, Iron worker. Born in Sweden. Naturalization Record: Nov. 16, 1922. Portland, Oregon, U. S. Dist. Court. Another Foreign Voter Registration Card was for April 12, 1927, and it listed Fred as a Republican, Pct. 29, born in Sweden, Naturalized the same date and place and living at the same address as on the 1930 card.
I have a photocopy of the Foreign Voter Registration Card for 1930. If you would like to receive it, please email me at the address this website has for me, and include your snail mail address.