Excerpt from El Presidio De San Francisco: A History Under Spain and Mexico, 1776-1846 For shelter, poles bent into a conical shape and covered in brush or tule sufficed. Occasionally, split redwood or redwood bark constituted the basic construction material. The building of balsas was another use for tule. Double-blade paddles moved these light craft through the water. 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.