I am researching the Poppenhagen family only in as much as it is connected to the Lenz family of Skokie, IL. Martha Lenz,an ethnic German born in Russian held Poland in 1894 daughter of Fredriech Lenz and Martha Tabor married Charles Poppenhagen and they lived in Skokie. Charles died in 1938. I don't believe they had any children but I'm hoping a more complete history and picture of her might exist.
Martha was a sister of Fred Lenz who was also an ethnic German born in Russian held Poland in 1883.
Chicago Tribune (IL) - February 23, 1977 POPPENHAGEN Deceased Name: Martha L. Poppenhagen, nee Lenz Martha L. Poppenhagen, nee Lenz, of Cassville, Wis., formerly of Skokie, beloved wife of the late Charles; dear sister of the late Fred Lenz. Funeral Thursday, 1 p.m., at Haben Funeral Home, 8057 Niles Center Rd., Skokie. Interment St. Paul Cemetery. Visitation Wednesday 6 to 9 p.m. OR 3-6111.

Interesting to note that a Martha L. Poppenhagen died 18 Feb. 1977 in Falls, Texas. Texas is where Martha's social security card was issued in 1966.
Wisconsin death index gives name and date but no city or county. Also of note is Chicago Tribune obituary was dated 23 Feb 1977.
Was her body shipped to Wisconsin and then to Skokie, IL for burial

Martha L Poppenhagen Texas Death Index, 1964-1998 death:18 Feb 1977 -Falls, Texas, United States record title:Texas Death Index, 1964-1998 name:Martha L Poppenhagen gender:Female death date:18 Feb 1977 death county:Falls death place:Falls, Texas, United States