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The Development of American Agriculture: A Historical Analysis (1998) Conkin, Paul. A Revolution Down on the Farm: The Transformation of American Agriculture since 1929 (2008) Gardner, Bruce L. (2002). American Agriculture in the Twentieth Century: How It Flourished and What It Cost. Harvard University Press. ISBN 0-674-00748-4. Hurt, R. Douglas.
A sample of MDF. Medium-density fibreboard (MDF) is an engineered wood product made by breaking down hardwood or softwood residuals into wood fibre, often in a defibrator, combining it with wax and a resin binder, and forming it into panels by applying high temperature and pressure. [1] MDF is generally denser than plywood.
Fiberboard (American English) or fibreboard (British English) is a type of engineered wood product that is made out of wood fibers. Types of fiberboard (in order of increasing density) include particle board or low-density fiberboard (LDF), medium-density fiberboard (MDF), and hardboard or high-density fiberboard (HDF).
Before the industrialisation of paper production the most common fiber source was recycled fibers from used textiles, called rags. The rags were from ramie, hemp, linen and cotton. [4] A process for removing printing inks from recycled paper was invented by German jurist Justus Claproth in 1774. [4] Today this method is called deinking.
A farmstead in Perry Township, Berks County, Pennsylvania.. Agriculture is a major industry in the U.S. commonwealth of Pennsylvania. [1] As of the most recent United States Census of Agriculture conducted in 2017, there were 53,157 farms in Pennsylvania, covering an area of 7,278,668 acres (2,945,572 hectares) with an average size of 137 acres (55 hectares) per farm. [2]
The history of agriculture in the United States covers the period from the first English settlers to the present day. In Colonial America, agriculture was the primary livelihood for 90% of the population, and most towns were shipping points for the export of agricultural products.
The agricultural policy of the United States is composed primarily of the periodically renewed federal U.S. farm bills.The Farm Bills have a rich history which initially sought to provide income and price support to US farmers and prevent them from adverse global as well as local supply and demand shocks.
Masonite was used as rear cover in many consumer electronics, into the early 1980s. It was more heat resistant than contemporary cheap plastic which was especially important for vacuum tube TVs and radios which generated high levels of heat in extended use. The electrical insulation properties were considered particularly useful for safety.