Detroit. Public schools. Dept. of instruction, teacher training and research. [from old catalog], Kepler, Frank Roy. [from old catalog] · Detroit · leaf 35
rtG. 3 7 Prob. 38. Grocers Scoop, Fig. 38. Scale, 4:=V-0\ … 6E:CTfON ON A A rtG. 38 35 Prob. 39. Funnel, Fig. 39. Scale, Q=V-0\
Projection
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