00410nam a2200133Ia 4500003000900000008004100009040001600050080001800066100001700084245004700101260005800148490005200206650001800258IN-BaIIA211028s9999    xx            000 0 eng d  cIIA Library  a083.8:52bPOR  aPorter, J. E 0aCatalogue of cometary orbitscJ. E. Porter  aHounslow WestbBritish Astronomical Associationc1961  aMemoirs of the british Astronomical Association  aComets-Orbits