Pioneer 10 and 11 Missions Jupiter encounters - Activities at Ames Research Center December 1973 and December 1974 - As a memento of the highly successful Pioneer 10 and 11 missions to Jupiter, this collection of photographs represents a sampling of those taken at Ames Research Center during the Jupiter encounter periods in December 1973 and December 1974. The captions for these photographs are meant to suggest the lighter side of the intense activities that took place during these periods. I would like to express my gratitude to all participants in the Pioneer 10/11 program for their teamwork in accomplishing the scientific and technical objectives of the Pioneer 10 and 11 missions to Jupiter. (signed) Charles F. Hall - Manager, Pioneer Project L-R: Dr. John H Wolfe, Robert R Nunamaker, Alfred M. Worden ARC-1969-A78-0077-5