First and second US printings of SOTI look like this.

First printings also have an R colophon on the publication page.

US second printings do not have the colophon.

US Second printings also have a "Second printing" notation inside the front flap.

Only a few copies were released with the bibliography (pp. 399-400)
before these pages were removed by the publisher for fear of lawsuits.
If you're lucky enough to have a copy of SOTI, check where pages 399-400 should be.
You'll probably see that the page was neatly sliced out.
It is suspected that no copies of the second print survived with the bibliography intact.
If you know of a second print with the bibliography, please contact SeductionOfTheInnocent.org.

The first UK printing looks like this.

WANTED! A photo of the 1972 printing by Kennikat Press. Do you have one?

One of several modern versions of SOTI (1996-2004)

2004 Printing, Blue Cover

2004 Printing, Green Cover

2004 Printing, Brown Cover

Eighth Printing, Blue Cover, White letters
Released June 1, 2010 on Amazon.com