Helen Dolman MacCracken.
Teacher's manual for How and why experiments, a teacher's manual and science handbook to accompany How and why experiments. (How and why science series, book 5)
R617829. Teacher's manual for How and why experiments, a teacher's manual and science handbook to accompany How and why experiments. By Helen Dolman MacCracken. (How and why science series, book 5) © 9Oct48; AA103048. Random House, Inc. (PWH); 12Nov75; R617829.
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