Walt Richmond & Leigh Richmond’s 1970 Gallagher’s Glacier is a standalone science fiction novel.
Humourless, by-the-book Captain Harald Dundee isn’t keen on hiring free-wheeling space engineer N. N. “Dublin” Gallagher, but circumstances give Dundee no choice. Their association is short. Gallagher only wants the gig so that he can strong-arm young Dundee into dropping Gallagher and some equipment on an unremarkable ice asteroid.
His curiosity piqued, Dundee checks in on Gallagher to see what the Space Irishman is doing. It’s straightforward enough: the iceteroid + an obsolete space drive = the first successful non-corporation-owned free trader: Gallagher’s Glacier.