In the first several decades of Confederation, they often chafed at the trade barriers that were put in place to protect and nurture the growth of the manufacturing industries of central Canada. (bankofcanada.ca)
Curiously, he found, in the first several decades after the first portolan chart was drawn, subsequent charts» accuracy declined a bit. (discovermagazine.com)
His paper in 1972 about this technique became a blueprint for the initial LIGO detectors, and the blueprint that guided us for the first several decades. (scientificamerican.com)