This work discusses the distribution and frequency of glass and lithic scrapers ?assemblages from 38 sites from SW Patagonia (South of the Deseado River) published by several authors. Available since 1520, glass became a desirable raw material for scrapers manufacture -especially in the eighteenth and nineteenth centuries- because of its knapping qualities and original format (bottles). However, between XVI and early XIX centuries, its availability was circumscribed to:-Shipwrecks on the coast -Trade with merchants -Contact with cities (Pacific and Atlantic Coasts)The establishment of cities (Punta Arenas -1848-, Piedrabuena -1859- ) and ?estancias? (1880) increased glass availability but only in the proximity of these places. Thus, while lithic scrapers have a uniform distribution and a lower frequencies (15 sites, N=113, max=36); glass scrapers are grouped near cities or ?estancias? (13 sites, N=688, min=198). It´s concluded that, when available, glass was more frequently selected than lithic raw material. This frequency might be related to the Aonikenk ?quillanguería? (hide working) from late XIX century, as it is postulated by other authors.