I recently discovered I See Sam Books. The books were published through a federally funded program in 1972 and made available in the public domain in 1977.
The original versions of 52 I See Sam books continue to be available for free. You can print, download, and view the original I See Sam books.
In 1993 changes were made to I See Sam books through the Reading For All Learners Program. The RALP versions of I See Sam books are copyrighted and can be purchased in printed form. There is also a free iPad app available. Reading For All Learners - I See Sam Phonics Books - Academic Success For All Learners Inc.