“Venus Highland—Artist’s concept of Ishtar Terra, loftiest and most dramatic continent-sized highland region on Venus, is based on radar mapping accomplished by the Pioneer Venus orbiter. Western part of Ishtar is mostly a smooth plateau, but the eastern region, at right, changes to a huge uplifted, broken region topped by the highest point yet found on Venus, a mountain massif called Maxwell Montes.”
The above is an extract from the July 1980, Vol. 11, No. 7 issue of “NASA Activities”. The image & the image with an outline of the continental United States superimposed over Ishtar Terra, were both featured on the cover of the issue.
In lieu of finding the image - SURPISE - my initial attempt at a description:
Artist’s concept of Ishtar Terra, the northern highland/continental mass of two such regions on Venus. Roughly the size of the contiguous United States, points on Ishtar rise to about 11 kilometers above the planet’s mean level.
One of many works by Rick Guidice during the 1970s for Ames Research Center (ARC), as is this one, and Jet Propulsion Laboratory (JPL).
The above is based on information as of ca. 1983, paraphrased from “NASA SP-461: PIONEER VENUS”, to include the version of the image with the overlaid outline of the contiguous U.S.A.
At:
ntrs.nasa.gov/api/citations/19830022069/downloads/1983002...
From the estate of Eric Burgess & possibly featured in the December 1980 issue of "Star & Sky" magazine, possibly as part of an article titled "Venus Unveiled".