Bob Gill wrote:Then there's Lee Grosscup's book Fourth and One,
I picked this up at a charity book sale last year and quite enjoyed it. It's a rare, unvarnished look at a journeyman's ups and downs over the course of a season.
Grosscup was neither a star nor a great writer, but the raw truth of the uncertainty of the game is compelling to read. Where else can you read a first-hand account of the early 1960s NFL AND the AFL? I recommend this.
This might not be in the top 100, but I had a copy as a kid and found one a couple years back:
Football Coaching by John McKay from 1966. It's a really good look inside the mind and daily preparation and overall program direction of one of college football's great coaches (who tried to apply some of those concepts in the NFL, to mixed results).
This is obviously not about the NFL per se, but I just finished
The Unforgettable Buzz the history of Tudor Games and electric football. I enjoyed it. It got a bit formulaic about halfway through, but it's an interesting read about a facet of the overall game that we don't always think about.
Rozelle: Czar of the NFL was a good read.
Namath was good, too (as was, in a campy way,
I Can't Wait Until Tomorrow...'Cause I Get Better Looking Every Day.)
The $1 League for sure if you were a USFL fan. Bernie Parrish's
They Call It A Game is a good look inside that time period from a guy very active in the players' union.
Stefan Fatsis'
A Few Seconds of Panic is well-written and takes you inside the minds of players who aren't stars (as well as Mike Shanahan).
In the fiction category, any of Peter Gent's books (the best-known, obviously, is
North Dallas Forty, but I have read
The Franchise several times and
North Dallas After Forty is also good) and Dan Jenkins'
Semi-Tough (the sequels just fall off a cliff).
And, of course, all the encyclopedias. In fact, the earlier the better. I have a few from the mid-70s that may not have as much information as you can find online, but which are charming in their own rights and have interesting quirks.
YMMV as to where things rank in the top 100, but it's good to have recommendations from folks.