Originally Posted by AirbornPegasus

I think the book referenced above is the Killing Zone by Dr. Paul Craig from Middle Tennessee State University. The "Killing Zone" defined by him is in 50 - 350 hour range. The link and synopsis is below.

The Killing Zone, Paul A. Craig, Book - Barnes & Noble
Synopsis

You can fly through the zone. Or you can die in it. Most pilots earn their private certificate with 40 to 70 flight hours. Then they leave their instructors behind and enter the killing zone. Grimly embracing the period from 50 to 350 flight hours--a vital time for new pilots to build practical and decision-making skills--this deadly zone lays in wait for those who err, killing more pilots than all other periods put together. You don't have to be one of them. Aviation safety specialist Paul Craig--discoverer of the killing zone--shows you the fatal errors that inexperienced pilots make time after time and gives you tactics to avoid them. Based on the first in-depth, scientific study of pilot behavior and general aviation flying accidents in more than 20 years, The Killing Zone:

*Identifies the time frame in which you are most likely to die

*Alerts you to the 12 mistakes most likely to kill you

*Outlines preventive strategies for flying through the zone alive

*Provides guidelines for avoiding, evading, diverting, correcting, and managing dangers

*Includes a "Pilot Personality Self-Assessment Exercise" for an individualized survival strategy

Survive the dangers that lurk in the killing zone.