according to the spiffy ace books five-digit system, cat# should've been increased by 1 from the previous printing, to 77782 (with consequent (i)sbn (0-)441-77782-1);
however this cat# had already been allocated to ''space visitor'' by mack reynolds (8/1977), q.v. (and ((0-)441-)77783(-X) to the second printing of this), possibly by mistake - and definitely outwith the rules of the ace books five-digit cat# system;
a quick manglement flail around evidently spotted 77779 as being unused, which was still unsystematic - the choice should've gone to a completely unused block of five (or even ten) adjacent cat#s commencing in a terminal ''0'' or a ''5'' (- or arguably, a partly-used block not reserved for another title's reprintings, commencing in a terminal ''2'', to follow on from the terminal ''1'' of 77781) - but it wasn't.
and, rather than follow this with 77778, counting down (- well, why not? -) from the anomalous 77779,
the next known printing was allocated 77784, with consequent isbn 0-441-77784-8, 9/1983;
but its cover is sufficiently different from all of the preceding three michael whelan-covered printings, by virtue of the art being reproduced reversed left-right, in mirror image, to definitely constitute a new bookcat item. (this comment is from another edition of this book)
berkley publishing group ace books mmpb presumédly the fifth printing over-all, with new cover design,
cover art by michael whelan (signed with his w/m in cartouche, uncredited: art including m/w reversed left-right from 1977 through 1980 printings; upper 40% cover now black, bears titles in blue & white)
cover price $2.75
indicia publishing history drops number line, adds new line stating
this printing / september 1983
248pp. (check) including titles, indicia etc, end pp. advertising (this comment is from another edition of this book)
grosset & dunlap charter communications undated° ace books imprint mmpb first standard format mmpb printing, second ace books printing over-all (first was pocketbook format mmpb F-325 1963)
cover art by michael whelan (signed with his m/w in a cartouche, credited)
cover price $1.50
248pp. (check) including titles, indicia etc, end pp. advertising
° - no printing or publication date of this printing given, date taken from locus having received their review copy 1/1977
distinguish from near-identical undated°° ace mmpb third printing mid-1977:
cat# 77781
(i)sbn (0-)441-7781-3
cover price $1.95
°° - no printing or publication date of this printing given, date obtained as being the month of the latest-published title advertised in the end page advertisements
distinguish from near-identical 1980 ace mmpb fourth printing with restyled, larger front cover titles:
cat# 77779
isbn 0-441-77779-1
cover price $2.25
indicia publishing history gives fourth printing by printing number line, and states
this ace printing december 1980
next (and last) known ace books 1983 mmpb printing has re-designed cover, reverses cover art left-right (this comment is from another edition of this book)
grosset & dunlap charter communications ace books imprint mmpb, fourth printing by number line
(third printing of this c. 1/1977 standard format p/b edition, after small pocketbook format first edition)
front cover typography re-designed in larger, (viking in panoramic) font, retains the two earlier printings'
cover art by michael whelan (signed with his m/w in a cartouche, credited)
cat# 77779
indicia publishing history adds line stating
this printing december 1980
cover price $2.25
248pp. (check) including titles, indicia etc, end pp. advertising (this comment is from another edition of this book)
printed in great britain by c. nicholls & company ltd
the philips park press, manchester
cover art by melvyn grant (signed "melvyn", uncredited)
cover price 85p, 93½p eire, 90c malta, $2.75 australia, $2.75 new zealand, $1.955 canada
so should be re-flagged "international" according to respected moderator's rule
- or not so re-flagged, according to equally well-respected moderator's heartfelt plea
australia recommended price only
224pp. including 4pp. titles, indicia etc, 2 end pp. advertising: 1p. ''close encounters of the third kind'', 1p. mail-order information (this comment is from another edition of this book)