Controlled Texts
(inc. Leveled Books, Decodable Books, and UURC Phonics Readers)

Once a student's instructional reading level has been determined, books of the appropriate level need to be located for that student to read in the presence of a skilled reader. However, book leveling is FAR from a "precise science."
Some guidelines for determining appropriate reading material below mid-first grade are provided here.
Caregivers/guardians looking for additional books on their student's instructional level are encouraged to use AR (Accelerated Reader) lists of books. The following link lists sites that have such AR lists:
Official AR BookFinder
or
Scholastic website
The AR lists assign books a grade and a month (i.e., 3.4 is the fourth month of the third grade), but because leveling is not precise some experimentation may be required on the caregiver/guardian's part. A good rule of thumb is that a student should not be making more than 1-2 errors in every 10 words as they read with assistance.
When looking for books in the library you may also find other leveling systems in place. Here is a PDF list of approximate correspondences across various systems.
Caregivers/guardians may purchase digital copies of UURC Phonics Readers (Onset + Vowel) that offer students targeted practice in applying early phonics skills through carefully crafted emergent texts through the UURC online storefront.