166 
Table I - Comparative Information on the Montana Waterfowl Breeding Ground 
Census of 1951 and 1952 
Sq. Mi. Ducks per Approx. Size Population Percent 
Area Sampled Sq. Mi. of Sample Area Estimate Change 
Northern Glaciated Prairie +10, 73* 
Eastern ; 
158.5 35 
1951 4.3 7,920 34,452 _ 5.6 
1952 158.5 4.12 32,630 
Central 
1951 132.75 10.16 96,195 
, 468 +25, 
1952 124,25 12, 80 7 121, 190 a8 
Sheridan Morraine 
1951 48 22.79 32,818 
| 1,440 ~ 6.4 
1952 48 21.35 30, 744 
Great Falls Piedmont 
1951 142.75 4.43 31,098 
7,020 - lll 
1952 137.75 4.38 30, 748 
Southern Unglaciated Prairie 
Trend Areas 
1951 599 0.71 
1952 599 1.08 +52.0 
Mountainous Area 
Trend Areas 
1951 14.25 28.1 
+13.0 
1952 14. 25 31.8 
er SP SS SS i SS gS Ss 
*Weighted percentage increase. 
