High School ArithmeticW. H. Ballard, J. T. (John Thomas) Crawford, R. A. (Ronald Augustine) ThompsonHäftad, 2021268 kr
Answers and Solutions to Prize Problems in Arithmetic [microform]W. H. Ballard, W. J. RobertsonHäftad, 2021175 kr
High School ArithmeticW. H. Ballard, J. T. (John Thomas) Crawford, R. A. (Ronald Augustine) ThompsonHäftad, 2021268 kr
Answers and Solutions to Prize Problems in Arithmetic [microform]W. H. Ballard, W. J. RobertsonHäftad, 2021175 kr