This rather obscure 1991 publication - reprinted several times up to 1998 - is actually very good, and well worth reading. It's a collection of six separate essays on the ET/UFO issue, each by a different author with a different perspective, edited by President of the 2020 Group Michael Lindemann.
The publisher is the "Visitors Investigation Project" of the 2020 Group, launched in 1990 to conduct validated studies on the UFO issue and its relationships to covert weapons development and formulating government policy. Lindemann himself works as a consultant to news media organizations and the business community, with a successful speaking career on a wide range of serious political subjects.
The contributors and titles of their essays are, in this order:
1. Stanton Friedman: The case for UFOs as alien spacecraft and the government UFO cover-up
2. Linda Moulton-Howe: The "Alien Harvest" and beyond
3. Bob Lazar: Alien technology in government hands
4. Budd Hopkins: The case for abductions (including an examination of the Pascagoula case)
5. "Tom": Personal encounters - the perspective of a credible and articulate abductee, with a typical personal story
6. Donald Ware: The larger reality behind UFOs
All six essays are well-written and thoughtful (even Bob Lazar's) and vary between 20 and 65 pages in length. I have never seen any of them in print elsewhere.
Lindemann's excellent introduction and conclusion to this collection of essays sum up the differing perspectives which attempt to explain the complexity of the phenomenon and the reasons why this particular group of contributors were chosen. Each contributor is demonstrably capable and accomplished in a field unrelated to this subject, which gives them great credibility as they have no vested financial interest in involvement in this field and conversely, place their reputations on the line. All are well-adjusted, university educated and with a high IQ; none claims to possess any final truth; all accept the apparent absurdities in their data and willingly accept the risks inherent in speaking out about what they have learned. Commitment to grapple with uncomfortable evidence and to speak publicly is "the difference which makes the difference", to quote Greg Bateson.
All the essays are essentially from the "liberal" viewpoint but not necessarily in agreement, and neither does the editor agree with or endorse everything said by each contributor, but is confident that the contributors chosen have gone further than most in investigating and understanding the issues and getting to an aspect of the truth of what is going on.
He sums up the situation briefly as follows:
* The alien presence is real
* It is substantial
* It is active and purposeful, and engaged in a wide variety of activities
* It is diverse, with more than one type of alien intelligence in evidence - some genuinely extraterrestrial, others Earth-based, and others possibly traversing parallel dimensions to appear among us briefly and then disappear again
* The alien presence is known to elite and secretive groups within the US government as well as elements inside other governments around the world. Public revelation of the alien presence is seen as posing an unacceptable risk to the social order, and the truth has been hidden behind the most aggressive and ingenious cover-up in history
Both the essays themselves and Lindemann's extensive introductory and concluding summaries of the situation are interesting, grounded and well-reasoned. The editing is excellent and the essays are highly literate, completely free of typos and grammatically near-perfect.