“The Trachtenberg Speed System of Basic Mathematics”. Jakow Trachtenberg; translated and adapted by Ann Cutler and Rudolph McShane. Condition: Clean, crisp copy, gently read if at all. Interior clean, unmarked.
“The Trachtenberg Speed System of Basic Mathematics”. Jakow Trachtenberg; translated and adapted by Ann Cutler and Rudolph McShane. Condition: Clean, crisp copy, gently read if at all. Interior clean, unmarked.