Greg Kroleski's marathon training plan, loosely based on Jack Daniels' formula, which got him to a 2:42 finish. Interesting to me because he only ran 5 days a week and averaged less than 42 miles per week, less than what I plan, but is much master than me. (He also has a plan where he runs only 3 days a week.)
Even though it conflicts a bit with the Jack Daniels plan I'm trying to follow (which has me running 7 days a week, about the same mileage every day during the first phase of training), I found this video by Jason Fitzgerald on planning weekly mileage to be useful as I try to put together a marathon training plan.
I like this guy's writing. I'm currently planning my summer marathon training and came across this article. The entries after this one mention him getting sick and DNFing his race -- but I'm still probably going to switch to 7 days a week of running as I increase my mileage.
A documentary following two attempts by Gary Robbins to finish the Barkley Marathons (2016 and 2017). I recommend first watching the documentary titled "The Barkley Marathons: The Race That Eats Its Young" (available on Netflix) to get an idea of what the race is all about.
Robbins ran again this year (2018) and was the only person to finish the fun run (but didn't make the cutoff for lap 4).