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Dear Mr. Bierbrodt-Reiser,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located the Population Schedules for the 1920 Census, the Population Schedules for the 1900 Census, and the Population Schedules for the 1880 Census but the digitized records for Osage County, Kansas have not been to the Catalog yet. Therefore, we searched Ancestry and located 6 entries for a Ehrenreich Reiser or E. Reiser. We also searched for Nicholas or Nicholaus and located 27 entries. We were less successful for Margaret. There may be a fee for using Ancestry. Or you may view these records online at one NARA's facilities for free via ALIC. For the nearest NARA location, please consult our web page at https://www.archives.gov/locations/. Also, some of the images from Ancestry are available for free on Family Search at https://www.familysearch.org/en/.
We hope this information is helpful. Best of luck with your family research!