Numbering continues from Buck Rogers (Western, 1964 series).
Indicia title is BUCK ROGERS for #2-4; BUCK ROGERS IN THE 25TH CENTURY for at least #6. The cover title is consistently Buck Rogers in the 25th Century.
#10 was not published. The Comic Reader #185 (11/1980) said that Buck Rogers #10, cover dated 01/1981, was supposed to be released 10/27/1980 and carry the book length "The Madness Without -- The Madness Within" by J. Marc DeMatteis and Al McWilliams. Apparently, this didn't happen due to distribution problems experienced by Western at the time, and it was rescheduled for one of the mass-distributed three-packs, but it doesn't look the missing #10 was included in any of these. The story was printed in German in Die Actionhelden (Condor, 1978 Series) #13, and was reprinted in one of the versions of Condor Superhelden Taschenbuch (Condor, 1978 series) #16.
Western also published a giant-size tabloid book which reprinted issues #2-4, the adaptation of the Buck Rogers movie. See Buck Rogers [Giant Movie Edition] (Western, 1979 series).