Ultimate Explorer Field Guide: Birds by Julie Beer Ultimate Explorer Field Guide: Rocks and Minerals by Nancy Honovich Ultimate Explorer Field Guide: Night Sky by Howard Schneider Ultimate Explorer Field Guide: Reptiles and Amphibians by Catherine H. Howell Ultimate Explorer Field Guide: Insects by Libby Romero Ultimate Explorer Field Guide: Trees by Patricia Daniels Ultimate Explorer Field Guide: Wildflowers by Libby Romero Ultimate Explorer Field Guide: Mammals by National Geographic, Kids
