I took a look at Peterson's Wikipedia page to double-check the date of the swap, and found a couple interesting bits of trivia I had no idea about:
During the final game at Yankee Stadium on Sunday, September 21, 2008, ESPN Sports announced that Fritz Peterson had the all-time lowest earned run average at Yankee Stadium, with a 2.52 ERA. Whitey Ford was second with a 2.55 ERA...Peterson was an All-Star in 1970, like Marty Pattin was in 1971, not that anyone remembers that about either one of them. My main recollection of Marty Pattin is that he did a spot-on Donald Duck impression.
In 1969 and 1970, Peterson had the best strikeout-to-walk ratios in the American League. Peterson also led the league in fewest walks per 9 innings pitched 5 years in a row, 1968-1972. The last pitcher who did that 5 years in a row was Cy Young...
I really should make note of every player mentioned in the book next time I start it from the beginning. Less than halfway through that sentence, it occurred to me that someone else has most likely done that by now. I guess either way I'll see which players I need to be an at-least-one-card-of-each-guy completist.