Henrietta Thornton-Verma

PreS-Gr 1—This playful letter-matching, speech-developing app opens with a parade of colorful, Pokemon-like creatures dancing across the screen...

Gr 10 Up—After an introduction that covers the history of American thinking on the environment and mentions figures from Ralph Waldo Emerson and Henry David Thoreau to Presidents Theodore Roosevelt and Barack Obama, this thorough set boasts essays on myriad aspects of the government's early, current, and future relationships to natural resources...

Gr 8 Up—The hundreds of entries in this detailed (but rather small font) time line are divided into chapters by century and labeled according to topic; categories are as broad as "Air Pollution" and "Public Health" and as narrow as "Cattle" and "Fur Trade...

This four-volume set provides a wide variety of perspectives about Earth's natural resources and explains the interrelationships among resource exploitation, environmentalism, geology, and biology...