Here's a list of the latest edition of each softcover Marvel Masterwork and when it went on sale...

Amazing Spider-Man: Vol. 6 (Vol. 33), on sale 10-05-11
The Avengers: Vol. 4 (Vol. 38), on sale 03-28-12
Captain America: Vol. 1 (Vol. 14) - on-sale date unrecorded by me
Daredevil: Vol. 2 (Vol. 29), on sale 05-25-11
Dr. Strange: Vol. 1 (Vol. 23), on sale 11-24-10
Fantastic Four: Vol. 7 (Vol. 34), on sale 10-26-11
Golden Age Marvel Comics: Vol. 1 (Vol. 36), on sale 12-28-11
The Incredible Hulk: Vol. 2 (Vol. 39), on sale 02-22-12
Iron Man: Vol. 1 (Vol. 20), on sale 03-24-10
Silver Surfer: Vol. 2 (Vol. 19), on sale 08-25-10
Sub-Mariner: Vol. 1 (Vol. 32), on sale 08-24-11
Thor: Vol. 3 (Vol. 30), on sale 06-29-11
Uncanny X-Men (1975): Vol. 4 (Vol. 37), on-sale date unrecorded by me but I first saw it 02-15-12
X-Men (1963): Vol. 4 (Vol. 35), on sale 11-23-11

And just because I can, here's the same list, sorted in chronological order by on-sale date:
03-24-10: Iron Man: Vol. 1 (Vol. 20)
08-25-10: Silver Surfer: Vol. 2 (Vol. 19)
11-24-10: Dr. Strange: Vol. 1 (Vol. 23)
05-25-11: Daredevil: Vol. 2 (Vol. 29)
06-29-11: Thor: Vol. 3 (Vol. 30)
08-24-11: Sub-Mariner: Vol. 1 (Vol. 32)
10-05-11: Amazing Spider-Man: Vol. 6 (Vol. 33)
10-26-11: Fantastic Four: Vol. 7 (Vol. 34)
11-23-11: X-Men (1963): Vol. 4 (Vol. 35)
12-28-11: Golden Age Marvel Comics: Vol. 1 (Vol. 36)
02-15-12 (first seen by me): Uncanny X-Men (1975): Vol. 4 (Vol. 37)
02-22-12: The Incredible Hulk: Vol. 2 (Vol. 39)
03-28-12: The Avengers: Vol. 4 (Vol. 38)
unrecorded by me: Captain America: Vol. 1 (Vol. 14)


Q. What is the ratio of Stanley Nickels to Schrute Bucks?
A. The same as the ratio of unicorns to leprechauns.