Thread:ADour/@comment-5060540-20131127022604/@comment-4651179-20131127042855

I've researched, and Harry Leland has some entries in different editions of the Official Handbook of the Marvel Universe and similar books.

These are the books that feature an entry for Black Bishop:


 * Official Handbook of the Marvel Universe (First Edition) H-J (1983)


 * Official Handbook of the Marvel Universe (Second Edition) G-H (1986)


 * Marvel Encyclopedia: X-Men (2003)

If you manage to find any of these books (I feel it's going to be easier to find the Marvel Encyclopedia: X-Men because it's more recent than the other ones), you'll find an entry for Harry Leland where the official description of his powers is given.