Starting in 1974, Corliss published a number of works in the "Sourcebook Project". Each volume was devoted to a scientific field (archeology, astronomy, geology, et cetera) and featured articles culled almost exclusively from scientific journals. Corliss was inspired by Charles Fort, who decades earlier also collected reports of unusual phenomena.[3]
Many of the articles in Corliss's works were earlier mentioned in Charles Fort's works. Unlike Fort, known for his idiosyncratic writing style, Corliss initially offered little in the way of his own opinions or editorial comments, preferring to let the articles speak for themselves. Corliss quoted all relevant parts of articles (often reprinting entire articles or stories, including illustrations). In some of his later Sourcebook efforts, such as the mid-1990s Biological Anomalies series, Corliss added his evaluation of both the reliability of the claims, and their ranking as anomalies. Well-documented reports from credible sources are ranked as a "1" while entirely unsubstantiated reports are rated as a "4", with "2" or "3" representing intermediate reports. Similarly, Corliss's uses a rating of "1" for anomalies that cannot be explained by existing scientific theories, while a "4" describes phenomena that are unusual but do not challenge scientific theories.
Corliss wrote many other books and articles, notably including 13 educational books about astronomy, outer space and space travel for NASA and a similar number for the Atomic Energy Commission and the National Science Foundation.[5]
In his book Unexplained!, Jerome Clark describes Corliss as "essentially conservative in outlook". He explains, "Corliss [is] more interested in unusual weather, ball lighting, geophysical oddities, extraordinary mirages, and the like — in short, anomalies that, while important in their own right, are far less likely to outrage mainstream scientists than those that delighted Fort, such as UFOs, monstrous creatures, or other sorts of extraordinary events and entities."[6]
Unlike Fort, Corliss selected his material almost exclusively from scientific journals like Nature and Science, not newspapers, so it has already been subjected to a filtering process which would have removed most hoaxes and reports from obvious cranks. Nevertheless, there is much that is quite baffling in some of these reports from highly reputable sources.[4]
The meteorologist Charles A. Doswell has praised the research of Corliss, stating his documentation of anomalies was intriguing.[7] However, the geologist Henry Faul has criticized Corliss. In a review for Handbook of Unusual Natural Phenomena, Faul noted:
[Corliss] is particularly prone, to classify things as "unexplained" even when a good explanation is available... Grossly incomplete, naively uncritical, supplied with inaccurate sketches (many of them fictitious, like the illustrations in old novels), and lacking an author index, it is no handbook at all. Instead of giving new access to genuinely mysterious observations, it only buries a few of them in a clutter of confused esoterica.[8]
In a review for a book that documented astronomical anomalies, the astronomer Joseph Veverka wrote that Corliss had shown negligence of the scientific literature for more than a decade and made incorrect statements.[9] However, Richard Baum wrote a mostly positive review, stating that it was an objective work and "his reviews are concise and well-referenced, and if on occasion his examples are questionable we do at least have the benefit of the bibliographies which will be useful to historians."[10]
Science journalist Jeremy Cherfas in the New Scientist, suggested that Corliss' book Incredible Life had an agenda to challenge evolutionary theory as he believed that natural selection fails to explain biological mysteries.[11] Science writer John Gribbin positively reviewed Corliss' book Unknown Earth in the New Scientist, stating it was a "delightful mixture of established science, and the lunatic fringe... Where else can you get such entertainment at so little cost?".[12]
^Doswell, Charles A. (1984). Severe and Unusual Weather by Joe R. Eagleman; Tornados, Dark Days, Anomalous Precipitation, and Related Weather Phenomena: A Catalog of Geophysical Anomalies by William R. Corliss. American Scientist. Vol. 72, No. 1. p. 83.
^Faul, Henry. (1977). Handbook of Unusual Natural Phenomena by William R. Corliss; John C. Holden. American Scientist. Vol. 65, No. 6. p. 776.
^Veverka, Joseph. (1986). The Moon and the Planets: A Catalog of Astronomical Anomalies by William R. Corliss. American Scientist. Vol. 74, No. 6. p. 670.
