Tales of the Teen Titans #44 is chock full of important events, and is an emerging Copper Age key book!  This book contains the story wherein Dick Grayson becomes Nightwing, the 1st appearance of Jericho, and the origin of Deathstroke the Terminator.  Marv Wolfman is on the story and George Perez does the cover and interior art.  This book is graded 9.6 NM+ with white pages by CGC.  Get your copy before it's out of reach!