1 “... efforts was the subject of the Fourth Workshop on Grand Unification held in Philadelphia and attended...”

2 “... Laboratories Philadelphia, Pennsylvania Enoch Callaway, M.D. Professor of Psychiatry University of California...”

3 “... by Liquid Metals". The symposium was held in Philadelphia, October 13-15, 1969, during the 1969 Fall Meeting...”

4 “... by Henri Blanchere in Dijon in 1973 and carried forward in Philadelphia and Manchester. Secondly...”