Papers on reduction methods for photographic meteorsDOI: info:10.5479/si.00810231.1-2.183v. 1No. 2Smithsonian Institution183–243
Smithsonian Astrophysical Observatory. 1957. "Papers on reduction methods for photographic meteors." Smithsonian Contributions to Astrophysics, 1, (2) 183–243. https://doi.org/10.5479/si.00810231.1-2.183.