P4D - What does P4D stand for? The Free Dictionary
References in periodicals archive
Increased visibility via mass media and new technology were listed as the primary reasons for increased public awareness of the problem, but the problem itself was believed not to have changed significantly in the preceding 20 years (P1A, P3C, P4D
, P5E, P6F, P9I).
J also pressed the switch appropriately when it was his turn (R4D, P4D
, I4D) in turn taking with another child in the animal's song.
This designation indicates that after a detailed validation process P4D