Grade level: 4, 5, 6, 7, 8, 9, 10, 11, 12, e, i, s, t.

The definitive field guide to the trees of North America, featuring maps, detailed illustrations, and information on more than 600 species of trees, from the pr

At a meeting of dendrochronologists an American colleague described the effects of volcanic eruptions on annual ring formation in bristlecone pines. I knew very

With millions of records now available online, those interested in their family history have a wealth of information—and misinformation—at their fingertips.

Grow your own apples, figs, plums, cherries, pears, apricots, and peaches in even the smallest backyard! Ann Ralph shows you how to cultivate small yet abundant