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Microplastics are minute pieces of plastic with diameters ranging from a few micrometers to a couple of millimeters. In recent years, microplastics have become a global marine environmental issue ...

Richard Scott Perkin (1906-1969) and Charles Elmer (1872-1954), one an investment banker and the other a court reporter, organized the Perkin-Elmer Optical Company in 1937, incorporated the firm in ...

At head of title: Navy Dept., Bureau of Aeronautics. "Date issued 19 Aug. 49." "Exhibitor's copy"--Cover. siris_sil_316265 ...