Family tree▼
http://www.interment.net/data/us/il/cook/mtgreenwood/green_pu.htm
"Illinois, Cook County Deaths, 1878-1922," index, FamilySearch (https://familysearch.org/pal:/MM9.1.1/N7NF-B3Y : accessed 10 Oct 2013), Henry Piersma, 22 Apr 1909.