BOB Books Readers Workbooks by Lynn Maslen Kertell, published by Scholastic, are a Costco-exclusive collection of early literacy workbooks designed to help young children build essential reading skills. Developed as part of the beloved BOB Books learn-to-read program, these workbooks complement the popular BOB Books phonics sets and are sold as special seasonal offerings in Costco's book and media section.

Each workbook guides children through progressive reading stages with phonics instruction, alphabet activities, writing practice, and comprehension exercises. The series covers skill levels from pre-readers and beginning readers through developing and emerging readers, making it suitable for children ages 3 and up, from Pre-K through early elementary grades.

Lynn Maslen Kertell is the current manager of the BOB Books program and author of numerous BOB Books titles, continuing the educational tradition started by her mother Bobby Lynn Maslen. The workbooks are published in partnership with Scholastic Inc., a trusted name in children's educational publishing.