This MODERN® Plan Book has duplicate pages. Every other sheet is light green with the word "duplicate" in white diagonally across the page, so that copies can be made for all lesson plans and activities. Books are 8-1/2" x 11" size with eight class periods per day. Block size is 1-7/8" x 1-7/8". Adequate space for a full year (40 weeks) of plans. No. 50.