Whether exploring places unknown, discovering strange creatures, or investigating the outer recesses of space, these high-interest books feature Time For Kids® content and will keep readers engaged as they build comprehension skills. These books offer: Alignment to Current States’ Standards, variety of text structures, complex informational text aligned to the content areas, and academic and domain-specific vocabulary. Guided reading levels are as follows: Grade K - Level A, Grade 1 - Level A-I, Grade 2 - Level I-M, Grade 3 - Level M-Q, Grade 4 - Level Q-S, Grade 5 - Level T-V. 30 Book Set