This issue has variants.
On-sale date from DC Releases #27. Dennis O'Neil credited as issue editor on letters page apparently in error.
This printing says "Abby's in Gotham City in Swamp Thing #51" in UPC box.
Colors credit confirmed by Anthony Tollin.
Story continues from Detective Comics #564.
Letters of comment from Jef Peckham, Jeff Melton, Joe Sarnicola, Elvis Orten, Greg Western, David Llyod Glenister, Lammers, Vincent R. Bellizia and Carl Cafarelli.