its customers for quantities of 25 or multiples thereof per issue, while the newer distributors had to use more conventional methods, putting together customer orders and re-shipping or delivering them from their own warehouses. Threats of legal action and the need for retailers to order very precise (and sometimes very small) quantities of items ended this practice for all but the largest customers by the end of the 1970s, and extended the ability to provide drop shipping to those large customers to all the direct distributors — by which time several of the newer distributors had multiple warehouses. Newsstand distribution through the IDs continued at the same time (and indeed remained dominant for years afterward, on its conventional returnable, low-discount terms). 1980s In the early 1980s, a trade organization, the International Association of Direct Distributors (IADD) was formed, consisting of all the distributors who purchased product directly from either DC, Marvel, or both. The IADD had annual conferences, issuing obscenity guidelines in 1987, and electing Diamond Comic Distributors' Steve Geppi as IADD Vice President in 1988. As early as 1980, Marvel Comics saw the growth potential of the direct market, and by 1981 was putting out a number of titles geared specifically to that market (including Dazzler and Ka-Zar the Savage). By the early 1980s, all the major publishers were producing material specifically for the new market, series that would probably not sell well enough on the newsstand, but sold well enough on a non-returnable basis to the more dedicated readers of the direct market to be profitable. Several of the new distributors lasted a relatively short time, and were succeeded by more competitive organizations; Diamond Comic Distributors replaced New Media/Irjax and Capital City Distribution largely replaced Big Rapids Distribution in the marketplace. By 1985, the number of direct distributors in North America peaked with approximately twenty companies, many of them multi-warehouse operations, purchasing product for resale to retailers directly from either DC Comics, Marvel Comics, or both. There were also an unknown number, probably in the dozens, of sub-distributors who bought DC and Marvel product from these larger companies (and often the products of other, smaller publishers direct from those publishers), and re-sold to retailers. Most of these sub-distributors were in cities in which the direct distributors themselves did not (at least as yet) have warehouses, including Philadelphia, Boston, Columbus (Ohio), Madison (Wisconsin), Lansing (Michigan), Indianapolis, and Berkeley (California).