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...early 1930s, the ''Britannica'' has developed several "spin-off" products to leverage its reputation as a reliable reference work and educational tool. ...kely inspired the "new plan" of the ''Britannica''. The first encyclopedia to include biographies of living people was the 64-volume ''[[Grosses Universa

...sounds. Cellulose insulation is plant fiber used in wall and roof cavities to separate the inside and outside of the building thermally and acoustically. ...gained significant national attention as a cheap and available technology to increase the energy efficiency of homes. In 1977, following a particularly