Early editions later split into two volumes

[Halvor (Raknes)]

In the colophon of this edition the following note appears:

Collector's Note: The original edition of Politics of Ecstasy has been divided into two books. This abbreviated edition carries the original title of Politics of Ecstasy and contains Chapters 1 to 11 of the original. The remaining material appears in a companion book entitled Tune In, Turn On, Drop Out which contains Chapters 12 to 22 of the original text.

For reference I also own an early edition, this one, published in 1970 which contains all 22 chapters.

How to make the distinction between which editions of Politics of Ecstasy belong to the abbreviated and which belong to the full versions I cannot say. It may, however be pretty easy to tell simply from the page counts. I'll leave that challenge to the librarians.