Cutdrawing of an SNAP 19 RTG, that are useed for Pioneer 10 and 11
Unknown author<span style="display: none;">Unknown author</span>
1977
PIONNER ODYSSEY Revised Edition (Chapter 3), see: <a rel="nofollow" class="external free" href="http://history.nasa.gov/SP-349/ch3.htm">http://history.nasa.gov/SP-349/ch3.htm</a>