Table:
text: List of wolf attacks in North America
Non-fatal attacks
Non-fatal attacks
Victims Age Gender Date_ Type_of_attack Location_ Details Sources_
Infant 1 ♀ Fall, 1975 Captive New Jersey While posing for picture with the wolf at a charity event for the Fund for Animals; it bit the side of her face ripping it open. She was hospitalized and given plastic surgery. Field and Stream
Dr. Bob Piorkowski, Alaska Fish and Game, and his wife  ♂/♀ October, 1975 Prey-testing agonistic charge Tonzona River, Alaska, USA, near Denali National Park Went outside their remote house near Denali National Park to see why their dog was barking, hoping it was a moose they could hunt. Five wolves came running straight at them, not at the dog, which was more than five meters away. Piorkowski was not ready to fire until the lead wolf was at point-blank range. He shot the next at ten meters away. Both wolves were dead, and the rest fled. Both wolves tested negative for rabies, and Piorkowski had one pelt mounted. p. 17

Question: What was the date of the attack on Dr. Bob Piorkowski and his wife in list of wolf attacks in North America?