Literature Cited
- Dale , Edgar and Chall , J. S. 1948 . “A Formula for Predicting Readability.” . Educational Research Bulletin , 27 : 11 – 20 .
- ESCP Evaluation Program . 1964–1965 . End of Year Report Boulder , Colorado Unpublished
- 1965–1968 . ESCP Survey and Feedback from Teachers Boulder , Colorado Unpublished. Investigating the Earth. 1967. Houghton Mifflin Company, Boston, Massachusetts
- Aa . 1967 . Investigating the Earth, Teacher's Guide Parts 1 and 2 , Boston , Massachusetts : Houghton Mifflin Company .
- Qutub , M. Y. 1969 . “The Objectives of the Earth Science Curriculum Project: An Evaluation of Their Achievements.” , Iowa State University Library . Unpublished disertation
- Roy , Chalmer J. 1964 . “Challenges of ESCP.” , ESCP Newsletter No. 4 Boulder , Colorado
- Roy , Chalmer J. 1969 . Ames , Iowa : Chairman of ESCP steering Committee, Dean of College of Science and Humanities, Iowa State University . Private Communication
- Smith , Nila Banton . 1964 . “What Have We Accomplished in Reading? A review of the past fifty years.” . In Revolution in Teaching: New Theory, Technology, and Curricula , Edited by: de Grazia , Alfred and Sohn , David A. 272 – 287 . New York , N. Y. : Bantam Books .