California Code, Education Code - EDC § 18203

(a) Funds appropriated for the purposes of this article shall be apportioned to eligible school districts in an equal amount per enrollment reported in the second principal apportionment of the prior fiscal year for kindergarten or any of grades 1 to 4, inclusive.  Upon receiving an apportionment, a school district shall allocate these funds to each schoolsite that maintains a kindergarten or any of grades 1 to 4, inclusive.  The schoolsite shall expend the funds for the purchase of grade-level appropriate reading materials in accordance with the districtwide kindergarten and grade 1 to grade 4, inclusive, classroom library plan required by Section 18201.

(b) For the purposes of this article, “grade-level appropriate reading materials” means nontextbook fiction and nonfiction books and periodicals.