A series of books and written articles in the field of mathematics and problem solving; Educational publications, namely, hand-outs, workbooks, study guides, and educational instruction guides in the fields of mathematics and problem solving; Printed instructional, educational, and teaching materials in the field of mathematics and problem solving

'articl':7 'book':4 'educ':16,26,39 'field':10,31,45 'guid':24,28 'hand':20 'hand-out':19 'instruct':27,38 'materi':42 'mathemat':12,33,47 'name':18 'out':21 'print':37 'problem':14,35,49 'public':17 'seri':2 'solv':15,36,50 'studi':23 'teach':41 'workbook':22 'written':6

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