The post was withdrawn from WORLD PHILATELIA due to the following e-mail received by the owner of the blog SCB
and many thanks for visiting my blog. Regarding your question at http://www.stampcollectingblog.com/best-free-stamp-catalogs.php
Like I wrote on my public response to You, I'm going to have to ask you to take down the copied article. All the content on SCB is copyrighted, and copying the full article 'as is' is in direct violation with the copyrights statement. Because of some misuse (mostly from spammers) I'm not making any exceptions to this policy, sadly.
But feel free to link to the article, or write your own opinions about the best resources.
I hope you understand my view.