  The gamma-ray & neutrino visibility of cosmic ray (CR) accelerators will be
dramatically increased by the presence of molecular material abutting such
sites due to the increased probability of pion production -- and, in the case
of neutral pions, subsequent gamma-decay. This was recognized by Pinkau,
Montmerle, and Black & Fazio, and others in the 1970's. In an effort to examine
the long-standing -- but unproven -- conjecture that galactic supernova
remnants (SNRs) are indeed the sites of nucleonic CR acceleration to <~300TeV/n
we have carried out a 3-way coincidence search between the SNRs in Green's
(2001) catalog, the GeV range unidentified sources from the third EGRET catalog
(Hartman et al.,1999), and molecular clouds, at low Galactic latitudes (|b|<~5
deg). In order to be quantitative regarding the distribution and amount of the
ambient molecular masses we have extracted the CO(J=1->0) mm wavelength data
from the compilation of Dame, Hartmann & Thaddeus (2001), at the best estimates
of the various SNR distances. We outline the overall correlative study and
examine the interesting case of SNR IC443, a likely accelerator of CR nuclei.
