Popp, 1964
Popp, H. M. (1964). Visual discrimination of alphabet letters.
The Reading Teacher, 17, 221-226.
Summary:
Researchers tested letter confusions in children.
Procedure:
65 kindergarteners (5-6 year-old) were tested via slide projector individually. A stimulus was shown and they selected an alternative from a set of two options (match-to-sample method).
Stimuli
Century style print , projected 1/4" in height (no other details specified).
Century Schoolbook sample from wikipedia:
Results
Confusion Matrix: 
References
Popp, H. M. (1964). Visual discrimination of alphabet letters.
The Reading Teacher, 17, 221-226.
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