Chall-Pop Phonics Level APHD, Helen M. Popp, Ed.D Jeanne S. Chall · First published 2001Open the Tome
A study of pre-reading tasks and reading achievement of first grade children tutored under the aegis of EdCo Reading and Learning CenterHelen M. Popp · First published 1973Open the Tome
Language and learningJanet A. Emig, Helen M. Popp · First published 1964 · Latest edition 1966Open the Tome
The measurement and training of visual discrimination skills prior to reading instructionHelen M. Popp, Harvard University. Graduate School of Education · First published 1964Open the Tome
Definition and mesurement of visual discrimination behavior as it relates to early reading instructionHelen M. Popp, Harvard University. Graduate School of Education · First published 1962Open the Tome
