And I found him (Lawrence senior that is)in:
"World War I Draft Registration Cards, 1917-1918"
name: Lawrence Christian Bertelson
event: Draft Registration
registration date year range: 1917-1918
event place: Morris County no 1, New Jersey, United States
birth date: 05 Feb 1881
birthplace: , ,
country of citizenship: Denmark
nara publication title: World War I Selective Service System Draft Registration Cards
nara publication number: M1509
film number: 1712356
digital folder number: 005218902
image number: 02357
He died 1967 in Morris.
LAWRENCE BERTELSON was born 05 February 1881, got Social Security number 148-22-6699 (indicating New Jersey,) and died May 1967.