1900 Census
Ferguson        Robert B         23  Male    Mi      CO      Phillips 2-Pct
1910 Census
Ferguson        Colonel E        49  Male    Mi      CO      Phillips 2-Pct
Ferguson        Bertha           36  Female  Ia      CO      Phillips 3-Pct
1920 Census
Ferguson        Robert B         43  Male    Mi      CO      Phillips 3-Pct