Hi, I was doing a search of the National Archives at monitor.nara.gov.80 I used NAIL standard search typed in Koch in the keyword box and came up with 70 hits. Starting with hit # 20 there are Kochs from Kansas that had to file Enemy Alien Registration Affidavits during WWI. There's info on them as to places of birth in Germany, photos, dates of birth etc. Hope this helps someone. Contact me if you have trouble finding it. Milli