There are so many great ideas, projects, products, and web sites out there, with more and more of them becoming available online on a daily basis, that we want you to realize that what we offer is but a small sampling. Moreover, we don't have the resources that would enable us to comprehensively cater to our audience's varied levels of competency. Another reason is that we don't want anyone to infer that we are endorsing any particular viewpoint by including it or that our having not mentioned it indicates that it is not worthy of recognition. So if we didn't mention a particular book about the history of AI, nothing should be inferred just as mentioning only one book on one of our pages should not be viewed as suggesting that everything you need to know can be found within its covers. When I revisited a certain topic, the resource that I had utilized on my prior visit no longer appeared on the page.
Several possibilities exist.
We periodically check links to make sure that they are still valid and consequently, resources with dead link are removed. Another reason could be that we wanted to freshen up the page with some new resources. We also reevaluate all of our content and it could be that the resource in question was no longer being maintained, or that it fell below our standards. In addition, online resources are available to everyone who can access this web site whereas the availability of printed resources depends upon the holdings in one's local library. For those who want to locate printed resources, we do offer links to major journals and bibliographies, and we do provide an introductory background such that you can efficiently and effectively use your local library's catalog.