Looking for or how to find birth records in Iona, Lyman, South Dakota. Around 1928

I don't seem to find it here on Ancestry.

This page tells you how to order a birth record from the 1920s:
http://doh.sd.gov/VitalRecords/order.aspx

For births from 1912 and older:
Birth Record Search Site - For South Dakota Birth Records - With Birth Dates Over 100 Years
http://apps.sd.gov/applications/PH14Over100BirthRec/index.as...