BALLARD, Philip Boswood
Teaching the essentials of arithmetic / [by] Philip Boswood Ballard - London University of london press 1928 - xxi, 260 p.
Includes index
72310
371.3511 / BAL
Teaching the essentials of arithmetic / [by] Philip Boswood Ballard - London University of london press 1928 - xxi, 260 p.
Includes index
72310
371.3511 / BAL