The front page of The Gridley Wave #48, June 1974, has this promo for the first British edition of TARZAN ALIVE and the first edition of MOTHER WAS A LOVELY BEAST and.
The University of Nebraska Press Spring/Summer 2006 print catalogue has a full page ad for their edition of TARZAN ALIVE
Where this ad or flyer ad or flyer originally appeared is currently unknown.
The back cover of BUNDUKI by J.T. Edson, DAW paperback 1976, lists both Opar novels.
Here is a large newspaper ad for GODS OF RIVERWORLD.
A half page ad for the hardcover printing from the November 1983 issue of Locus (#274).
A full page ad for the paperback printing from the January
1985 issue of Locus (#288).
The February 1985 issue of Heavy Metal has a preview of THE GRAND ADVENTURE.
The back cover is devoted to it and there is a
full page ad from Berkley on page 19.
There is also a full page ad in the November 1984 issue of Locus (#286).