John Gee has been commenting on some relevant issues on his blog. See:
http://fornspollfira.blogspot.com/2015/06/types-of-evidence.html
http://fornspollfira.blogspot.com/2015/06/some-other-pseudo-sciences.html
http://fornspollfira.blogspot.com/2015/06/is-numismatics-academic-discipline.html