#1 Collins, Mark "Nurgle" writes computer gaming books; not the same as Collins, Mark J. (Mark Jeffery) who also writes computer books (LC 2001012806)
#2 Collins, Mark, 1959- author of Mr. Rogers' neighborhood (LC 97067423)
#3 Collins, Mark (Mark Leonard), author of Grammar works.
4) Mark Collins, British conservationist, aliased into N Mark Collins