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41Published 1981“...National Council of Teachers of Mathematics,...”
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42by Schaaf, William Leonard, 1898-“...National Council of Teachers of Mathematics,...”
Published 1976
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43
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44Published 1978“...National Council of Teachers of Mathematics,...”
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45Published 1986“...National Council of Teachers of Mathematics,...”
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46Published 1970“...National Council of Teachers of Mathematics,...”
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47Published 1981“...National Council of Teachers of Mathematics,...”
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48
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49Published 1983“...National Council of Teachers of Mathematics,...”
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50Published 1977“...National Council of Teachers of Mathematics,...”
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51by Yates, Robert C. (Robert Carl), 1904-1963“...National Council of Teachers of Mathematics,...”
Published 1974
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52Published 1975“...National Council of Teachers of Mathematics,...”
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53Published 1976“...National Council of Teachers of Mathematics,...”
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54
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55
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56
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57Published 1984“...National Council of Teachers of Mathematics,...”
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58Published 1982“...National Council of Teachers of Mathematics,...”
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59
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60