Table:
text: 1965–66 Colchester United F.C. season
Players
Players
Pos_ Name_ Place_of_Birth Date_of_Birth Previous_Club Date_Joined Fee_
DF David Raine Darlington 28 March 1937 Doncaster Rovers 24 September 1965 Free
MF Barrie Aitchison Colchester 15 November 1937 Tottenham Hotspur 22 August 1964 £750
MF Bobby Blackwood Edinburgh 20 August 1934 Ipswich Town 1 September 1965 Free
MF Arthur Kaye Higham 9 May 1933 Middlesbrough 21 August 1965 Free
MF John Mansfield Colchester 13 September 1946 Youth Team 1 August 1964 Free
MF Derek Trevis Birmingham 9 September 1942 Aston Villa 7 March 1964 Free
FW Peter Bullock Stoke-on-Trent 17 November 1941 Southend United 30 October 1965 Free
FW Reg Stratton Kingsley 10 July 1939 Fulham 21 August 1965 Free

text: 1965–66 Colchester United F.C. season
Players
Players
Pos_ Name_ Place_of_Birth Date_of_Birth Previous_Club Date_Joined Fee_
GK Alan Buck Colchester 25 August 1946 Youth Team 1 August 1964 Free
GK Sandy Kennon Johannesburg 28 November 1933 Norwich City 6 March 1965 Free
DF Duncan Forbes Edinburgh 19 June 1941 Musselburgh Athletic 14 April 1962 Free
DF John Fowler Leith 17 October 1933 Bonnyrigg Rose Athletic 20 August 1955 Free
DF Brian Hall Burbage 9 March 1939 Mansfield Town 6 March 1965 Free
DF Mick Loughton Colchester 8 December 1942 Youth Team 1 August 1964 Free
DF Ray Price Hetton-le-Hole 18 May 1944 Norwich City 6 February 1965 Free

Question: How many players are listed as df in Colchester United FC in 1965/66 season?