The old PSSC films including the frames of reference are available on
video disc(s!). There are three of them in the set from Ztek Co.
Ztek Co.
PO Box 1055
Louisville, KY 40201 1055
ISBN 1-56934-000-5
THO
Thomas O'Neill o'neill@csvrgs.k12.va.us
Physics Instructor
C Shenandoah Valley R Governor's School (540) 245 5088
Fishersville, Virginia 22939