"Silvics of Forest Trees of the United States," Agriculture Handbook 271, was the first comprehensive document of its kind in the United States. […] The original "silvics manual" took 10 years to complete and was published in 1965.
1990, Jerry A. Sesco, Foreword, Russell M. Burns, Barbara H. Honkala, Silvics of North America, Volume 1: Conifers, Agriculture Handbook 654, US Department of Agriculture, page iii