DO NOT COMBINE THIS WORK with Exterminator! (1973). The Exterminator and Exterminator! are not the same work.
The Exterminator (note the article and absence of a "!" at the end) is an early "cut-up" work co-written with Brion Gysin, originally published in 1960, reprinted only once (in 1967), and published in a critical edition (edited by Oliver Harris) in 2020.
Exterminator! is (despite its subtitle: "a novel") a collection of short pieces originally written from the mid-'60s to early '70s, and first published in this form in 1973. It has been reprinted many times and is still in print as of 2022.