e obstruction. No excava- the wall is turned down, and passes with increased An excellent opportunity has been given in the Co- tion takes place in front or around the sides. If the lumbia Valley to study the exact effect of wind cur- velocity through the opening at the bottom, carrying obstruction… … Covering Sandhills With Wooden Framework to Prevent Them from Burying a Forest. Wood Breastworks for Fighting the Sand. SAND WAVES AND THEIR WORE.
Sand · Motor · Patents · Engine · Railroad · Scientific American · Gas · Reinforced concrete · Oxygenized water · American february · Sand waves · Gas engine · San Francisco · Square inch · Merchant marine · Great deal
Internet Archive · Public domain (published before 1931). Free to use for anything.
