It's actually Rudy Nebres, not "Nubres." He, along with Ernie Chan, was one of the first Filipino creators to work in American superhero/fantasy comics. Nebres' work on the Deadly Hands of Kung Fu book was incredible. DHOKF generally had awesome art anyway (as well as no ads, tons of actual articles about martial arts, interviews, etc.), but Nebres' work was just five-star skull-cleaning stuff. (Both Tony Isabella and Don McGregor contributed editing duties to DHOKF, which should be a testament to its caliber.)
I don't think that it's been traded on its own.
Some of Danny's early pre-HFH/solo series appearances, if memory serves, are included Essential Iron Fist.