Given the question: What key details about john walker -lrb- rugby league -rrb- can be extracted from the following bio? Bio: john walker is a professional rugby league footballer of the 1960s , playing at club level for castleford .
The answer is:
- teama is yorkshire- source is -lsb- http://www.rugbyleagueproject.org/players/all.html rugbyleagueproject.org -rsb-- points is 81- fieldgoals is 0- pointsa is 0- appearances is 220- triesa is 0- tries is 27- new is yes- retired is yes- name is john walker- appearancesa is 1- updated is 7 january 2014- goalsa is 0- yearastart is 1963- yearend is 68- yearstart is 1960- fieldgoalsa is 0- club is castleford- goals is 0