While Essential The Amazing Spider-Man started with Spider-Man's first appearance in the Silver Age (collecting Amazing Fantasy #15 and The Amazing Spider-Man #1-20), Marvel chose to skip ahead to Giant-Size X-Men #1 and Uncanny X-Men #94-119, the relaunch of the title that sparked the X-Men's popularity in the late 1970s and 1980s.
2 both have missing pages from their earlier printings) and reshuffled content to put volume breaks in more logical places, continuity-wise.
In 2008, the line's trade dress was revised and given a new look, again initially on older volumes that were going back to press for new printings.
Both volumes contained reprints of Dracula stories originally published by Marvel in magazine format, which permitted the use of nudity in artwork.
The last volumes were published in December 2013, with the line being cancelled and replaced with the Marvel Epic Collection.