Excerpt from Response of the Engraver Beetle, Ips Perturbatus, to Semiochemicals in White Spruce Stands of Interior Alaska The use of trade or firm names in this publication is for reader information and does not imply endorsement by the us. Department of Agriculture of any product or service. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.