You're right twice, Superman. The O'Hara story is probably Zolnerowich inks, but I can't discern the penciler. Simon Danser is definitely Ulmer. Tiger of the Headlines is Al Bare. Lucky Grave Stone appears to be penciled by Art Peddy. And I'm unable to find where Prentice is supposed to have signed the last story. First Day on the Force looks somewhat like Leo Morey and/or Lawrence Dresser, but my memory is failing me. I can't remember. Sigh... (|:{>
Link to the book:
Real Clue Crime Stories v05 005