Early Amateur Call Signs

Does anyone have the call signs used by these early radio experimenters? I can't find any reference in any early callbooks. Before licensing started in 1912 calls were self-assigned (often initials or names, like mine!). They would have had to been hams to have gotten the experience they had.

Wanted are Alfred T. Morgan (author), Hugo Gernsback (dealer and publisher), Frank Conrad (BC pioneer of KDKA who used experimental call of 8XK), and the hero of us all Edwin R. Armstrong. Some may have had operator's licenses only after 1912 and used the station call of others or club calls (originally all with a "Z" in the suffix).

73, Roy T. Tucker, N6TK, La Mirada, CA