Links that come in handy:
Find a Grave @ https://www.findagrave.com/
Danish National Archives @ https://en.rigsarkivet.dk/
Danish Family Search @ https://www.danishfamilysearch.com/
Rock County (WI) Genealogical Society @ https://www.rcgswi.org/
State of Wisconsin Collection @ https://search.library.wisc.edu/digital/AWI
Ellis Island Passenger search @ https://heritage.statueofliberty.org/passenger-result
Wisconsin Historical Society Collections @ https://www.wisconsinhistory.org/Records/Article/CS15307
Saint Croix County (WI) Genealogy and Local History @ https://www.uwrf.edu/AreaResearchCenter/Genealogy/Index.cfm
ROCK Country Atlas 1917 @ https://search.library.wisc.edu/digital/AGNNQDSEXH56SX8D
Walworth County Atlas 1921 @ https://search.library.wisc.edu/digital/AML7NQJ75NH7F39E
Date Calculators @ https://www.timeanddate.com/date/