GRL – Guided Reading Level (Fountas and Pinnell)
AGL – Accelerated Grade Level (Accelerated Reader GRADE Level) or Flesch-Kincaid
Remember that the levels are not absolutes – only an indicator of the approximate level. The same book may appear at different levels depending on the leveling resource used.
This book is listed in the DLG for Grade 1, Little Lad
Winters and Carpenter