In the mid-80s, DC tried a “hardcover/softcover” experiment with three of its best-selling comics: New Teen Titans, Legion of Super-Heroes and Batman and the Outsiders. Basically, each series was upgraded to a higher quality book (a “hardcover” version)… and after one year, the “hardcover” stories were reprinted in the original newsstand comic (the “softcover” version).
The “hardcover” versions were printed on better paper (called Baxter paper; it was a heavier paper stock and whiter) and sold only through comic shops (rather than newsstands, like the original series). These series are sometimes referred to as the Baxter books.
After the Baxter books launched, the “softcover” newsstand titles received new names: “New Teen Titans” became “Tale of the Teen Titans,” “Legion of Super-Heroes” became “Tales of the Legion of Super-Heroes” and “Batman and the Outsiders” became “Adventures of the Outsiders.” For one year, the newsstand titles still featured new stories… so, for 12 months, each team actually had two comics that featured new content.
DC keep the newsstand titles alive because the company didn’t want to alienate those fans who didn’t have access to comic shops and/or did not want to pay for the premium higher priced Baxter books. This was during the early days of the direct market, when comic shops were not as common as they are now. “Tales/TT” and “Tales/LSH” both continued as reprint books for several years. However, “Adventures/Outsiders” only lasted a couple of months once the reprints started.