So, I purchased a whole lot of dish tubs. I sorted my book by topic and marked them with colored dot stickers, or arrangements of stickers. The tubs are easy to carry, easy to look through and the stickers help the students with the skill of matching. Students can use the library with a minimum of assistance from me and I can arrange the tubs on tables, shelves or on the floor. This is the most user friendly my library has ever been!