Level 11 -
Level 12 -
Level 12 - Windows On Literacy Early People Live in the Desert
Level 12 - Windows On Literacy Early Water Land and Air
Level 13 - Windows On Literacy Fluent Rocks
Level 13 - Windows On Literacy Fluent Using Rocks
Level 14 - Windows On Literacy Fluent From Field to Forest
Level 17 - Windows On Literacy Fluent Desert Rain
Level 17 - Windows On Literacy Fluent Fossils
Level 17 - Windows On Literacy Fluent Soil
Level 18 - Windows On Literacy Fluent Going Up the Mountain
Level 18 - Windows On Literacy Fluent The Rain Forest
Level 21 - Windows On Literacy Fluent Plus Caves
Level 21 - Windows On Literacy Fluent Plus Sand
Level 22 - Windows On Literacy - Fluent Plus Protecting Sea Turtles
Level 26 - Windows On Literacy Fluent Plus Volcanoes
Level 28-32 - 
8.5+Yrs - Go Facts - Natural Disasters - Complete Set - 4 Readers and one Teaching Guide
8.5+Yrs - Brainwaves - Purple - On the Edge of Extinction
8.5+Yrs - Brainwaves - Purple - Survival against the Odds
9.5+Yrs - Go Facts - Environmental Issues - Complete Set - 4 Readers + Teaching Guide