Table 13 MONTHLY Sr?° LEVELS IN POWDERED MILK FROM COLUMBUS, WISCONSIN AND MANDAN, NORTH DAKOTA Columbus, Wisconsin $r7O 1957 yne/g Ca sr T$30 (1) November 4.36 * 0.37 he2 2 02 January eel a O42 3.6 2 0.1 heB81 2 Ooll 366 2 002 December Mandan, North Dakota (2) Sr70 ync/g Ca sry $190 (1) 29057 2 0.26 20011 2 0.66 1958 February March April May June hel2 % 0635 00 * 0.33 he76 t O.L4 Lely 2 003 09 * Onl 1.6 2 1.2 15.2 2 16.46 % 0.63 15.57 7 0.64 21.65 20.72 2630 5) July August September October November (1) (2) Extrapolated to midpoint of sampling period. Buttermilk. - 89 - 0.53 706 t 0.8 5.0 7 1.5 4.3 * 003 ho% 2 003 700 200