00544nam a2200169Ia 4500003000900000008004100009020001800050040001600068080001900084110004600103245010900149260005500258300002300313650001300336650001600349650000900365IN-BaIIA211028s9999    xx            000 0 eng d  a0-11-886938-8  cIIA Library  a059:52bAAL-91  aUnited States. Government Printing Office 4aThe astronomical almanac for the year 1991cU.S.Government Printing Office                                aWashingtonbU. S. Government Printing Officec1990  a[various pagings.]  aAlmanacs  aEphemerides  aNASA