Dane Hartman. Duel for Cannons (1981) (Dirty Harry #1) 173 pp. [pbo]
Publisher’s description: “‘Dirty Harry’ Callahan blasts his way from the mean streets of San Francisco to the blazing byways of San Antonio. His target—a crime boss who’s got the whole town, including the cops, under his thumb. Harry’s all alone now, with nothing but a .44 Magnum and a bagful of dirty tricks between him and instant death!”
Setting: San Francisco; San Antonio (Tex.)